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Annotation of Gnu-Mach/linux/src/drivers/net/via-rhine.c, revision 1.1

1.1     ! root        1: /* via-rhine.c: A Linux Ethernet device driver for VIA Rhine family chips. */
        !             2: /*
        !             3:        Written 1998 by Donald Becker.
        !             4: 
        !             5:        This software may be used and distributed according to the terms
        !             6:        of the GNU Public License (GPL), incorporated herein by reference.
        !             7:        Drivers derived from this code also fall under the GPL and must retain
        !             8:        this authorship and copyright notice.
        !             9: 
        !            10:        This driver is designed for the VIA VT86c100A Rhine-II PCI Fast Ethernet
        !            11:        controller.  It also works with the older 3043 Rhine-I chip.
        !            12: 
        !            13:        The author may be reached as [email protected], or
        !            14:        Donald Becker
        !            15:        312 Severn Ave. #W302
        !            16:        Annapolis MD 21403
        !            17: 
        !            18:        Support and updates available at
        !            19:        http://cesdis.gsfc.nasa.gov/linux/drivers/via-rhine.html
        !            20: */
        !            21: 
        !            22: static const char *versionA =
        !            23: "via-rhine.c:v1.00 9/5/98  Written by Donald Becker\n";
        !            24: static const char *versionB =
        !            25: "  http://cesdis.gsfc.nasa.gov/linux/drivers/via-rhine.html\n";
        !            26: 
        !            27: /* A few user-configurable values.   These may be modified when a driver
        !            28:    module is loaded.*/
        !            29: 
        !            30: static int debug = 1;                  /* 1 normal messages, 0 quiet .. 7 verbose. */
        !            31: static int max_interrupt_work = 20;
        !            32: static int min_pci_latency = 64;
        !            33: 
        !            34: /* Set the copy breakpoint for the copy-only-tiny-frames scheme.
        !            35:    Setting to > 1518 effectively disables this feature. */
        !            36: static int rx_copybreak = 0;
        !            37: 
        !            38: /* Used to pass the media type, etc.
        !            39:    Both 'options[]' and 'full_duplex[]' should exist for driver
        !            40:    interoperability.
        !            41:    The media type is usually passed in 'options[]'.
        !            42: */
        !            43: #define MAX_UNITS 8            /* More are supported, limit only on options */
        !            44: static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
        !            45: static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
        !            46: 
        !            47: /* Maximum number of multicast addresses to filter (vs. rx-all-multicast).
        !            48:    The Rhine has a 64 element 8390-like hash table.  */
        !            49: static const int multicast_filter_limit = 32;
        !            50: 
        !            51: /* Operational parameters that are set at compile time. */
        !            52: 
        !            53: /* Keep the ring sizes a power of two for compile efficiency.
        !            54:    The compiler will convert <unsigned>'%'<2^N> into a bit mask.
        !            55:    Making the Tx ring too large decreases the effectiveness of channel
        !            56:    bonding and packet priority.
        !            57:    There are no ill effects from too-large receive rings. */
        !            58: #define TX_RING_SIZE   8
        !            59: #define RX_RING_SIZE   16
        !            60: 
        !            61: /* Operational parameters that usually are not changed. */
        !            62: /* Time in jiffies before concluding the transmitter is hung. */
        !            63: #define TX_TIMEOUT  (2*HZ)
        !            64: 
        !            65: #define PKT_BUF_SZ             1536                    /* Size of each temporary Rx buffer.*/
        !            66: 
        !            67: /* Include files, designed to support most kernel versions 2.0.0 and later. */
        !            68: #include <linux/config.h>
        !            69: #include <linux/version.h>
        !            70: #ifdef MODULE
        !            71: #ifdef MODVERSIONS
        !            72: #include <linux/modversions.h>
        !            73: #endif
        !            74: #include <linux/module.h>
        !            75: #else
        !            76: #define MOD_INC_USE_COUNT
        !            77: #define MOD_DEC_USE_COUNT
        !            78: #endif
        !            79: 
        !            80: #include <linux/kernel.h>
        !            81: #include <linux/string.h>
        !            82: #include <linux/timer.h>
        !            83: #include <linux/errno.h>
        !            84: #include <linux/ioport.h>
        !            85: #include <linux/malloc.h>
        !            86: #include <linux/interrupt.h>
        !            87: #include <linux/pci.h>
        !            88: #include <linux/netdevice.h>
        !            89: #include <linux/etherdevice.h>
        !            90: #include <linux/skbuff.h>
        !            91: #include <asm/processor.h>             /* Processor type for cache alignment. */
        !            92: #include <asm/bitops.h>
        !            93: #include <asm/io.h>
        !            94: 
        !            95: /* This driver was written to use PCI memory space, however some boards
        !            96:    only work with I/O space accesses. */
        !            97: #define VIA_USE_IO
        !            98: #ifdef VIA_USE_IO
        !            99: #undef readb
        !           100: #undef readw
        !           101: #undef readl
        !           102: #undef writeb
        !           103: #undef writew
        !           104: #undef writel
        !           105: #define readb inb
        !           106: #define readw inw
        !           107: #define readl inl
        !           108: #define writeb outb
        !           109: #define writew outw
        !           110: #define writel outl
        !           111: #endif
        !           112: 
        !           113: /* Kernel compatibility defines, some common to David Hind's PCMCIA package.
        !           114:    This is only in the support-all-kernels source code. */
        !           115: 
        !           116: #define RUN_AT(x) (jiffies + (x))
        !           117: 
        !           118: #if (LINUX_VERSION_CODE >= 0x20100)
        !           119: char kernel_version[] = UTS_RELEASE;
        !           120: #else
        !           121: #ifndef __alpha__
        !           122: #define ioremap vremap
        !           123: #define iounmap vfree
        !           124: #endif
        !           125: #endif
        !           126: #if defined(MODULE) && LINUX_VERSION_CODE > 0x20115
        !           127: MODULE_AUTHOR("Donald Becker <[email protected]>");
        !           128: MODULE_DESCRIPTION("VIA Rhine PCI Fast Ethernet driver");
        !           129: MODULE_PARM(max_interrupt_work, "i");
        !           130: MODULE_PARM(min_pci_latency, "i");
        !           131: MODULE_PARM(debug, "i");
        !           132: MODULE_PARM(rx_copybreak, "i");
        !           133: MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
        !           134: MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i");
        !           135: #endif
        !           136: #if LINUX_VERSION_CODE < 0x20123
        !           137: #define test_and_set_bit(val, addr) set_bit(val, addr)
        !           138: #endif
        !           139: #if LINUX_VERSION_CODE <= 0x20139
        !           140: #define        net_device_stats enet_statistics
        !           141: #else
        !           142: #define NETSTATS_VER2
        !           143: #endif
        !           144: #if LINUX_VERSION_CODE < 0x20155  ||  defined(CARDBUS)
        !           145: /* Grrrr, the PCI code changed, but did not consider CardBus... */
        !           146: #include <linux/bios32.h>
        !           147: #define PCI_SUPPORT_VER1
        !           148: #else
        !           149: #define PCI_SUPPORT_VER2
        !           150: #endif
        !           151: #if LINUX_VERSION_CODE < 0x20159
        !           152: #define dev_free_skb(skb) dev_kfree_skb(skb, FREE_WRITE);
        !           153: #else
        !           154: #define dev_free_skb(skb) dev_kfree_skb(skb);
        !           155: #endif
        !           156: 
        !           157: 
        !           158: /*
        !           159:                                Theory of Operation
        !           160: 
        !           161: I. Board Compatibility
        !           162: 
        !           163: This driver is designed for the VIA 86c100A Rhine-II PCI Fast Ethernet
        !           164: controller.
        !           165: 
        !           166: II. Board-specific settings
        !           167: 
        !           168: Boards with this chip are functional only in a bus-master PCI slot.
        !           169: 
        !           170: Many operational settings are loaded from the EEPROM to the Config word at
        !           171: offset 0x78.  This driver assumes that they are correct.
        !           172: If this driver is compiled to use PCI memory space operations the EEPROM
        !           173: must be configured to enable memory ops.
        !           174: 
        !           175: III. Driver operation
        !           176: 
        !           177: IIIa. Ring buffers
        !           178: 
        !           179: This driver uses two statically allocated fixed-size descriptor lists
        !           180: formed into rings by a branch from the final descriptor to the beginning of
        !           181: the list.  The ring sizes are set at compile time by RX/TX_RING_SIZE.
        !           182: 
        !           183: IIIb/c. Transmit/Receive Structure
        !           184: 
        !           185: This driver attempts to use a zero-copy receive and transmit scheme.
        !           186: 
        !           187: Alas, all data buffers are required to start on a 32 bit boundary, so
        !           188: the driver must often copy transmit packets into bounce buffers.
        !           189: 
        !           190: The driver allocates full frame size skbuffs for the Rx ring buffers at
        !           191: open() time and passes the skb->data field to the chip as receive data
        !           192: buffers.  When an incoming frame is less than RX_COPYBREAK bytes long,
        !           193: a fresh skbuff is allocated and the frame is copied to the new skbuff.
        !           194: When the incoming frame is larger, the skbuff is passed directly up the
        !           195: protocol stack.  Buffers consumed this way are replaced by newly allocated
        !           196: skbuffs in the last phase of netdev_rx().
        !           197: 
        !           198: The RX_COPYBREAK value is chosen to trade-off the memory wasted by
        !           199: using a full-sized skbuff for small frames vs. the copying costs of larger
        !           200: frames.  New boards are typically used in generously configured machines
        !           201: and the underfilled buffers have negligible impact compared to the benefit of
        !           202: a single allocation size, so the default value of zero results in never
        !           203: copying packets.  When copying is done, the cost is usually mitigated by using
        !           204: a combined copy/checksum routine.  Copying also preloads the cache, which is
        !           205: most useful with small frames.
        !           206: 
        !           207: Since the VIA chips are only able to transfer data to buffers on 32 bit
        !           208: boundaries, the the IP header at offset 14 in an ethernet frame isn't
        !           209: longword aligned for further processing.  Copying these unaligned buffers
        !           210: has the beneficial effect of 16-byte aligning the IP header.
        !           211: 
        !           212: IIId. Synchronization
        !           213: 
        !           214: The driver runs as two independent, single-threaded flows of control.  One
        !           215: is the send-packet routine, which enforces single-threaded use by the
        !           216: dev->tbusy flag.  The other thread is the interrupt handler, which is single
        !           217: threaded by the hardware and interrupt handling software.
        !           218: 
        !           219: The send packet thread has partial control over the Tx ring and 'dev->tbusy'
        !           220: flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
        !           221: queue slot is empty, it clears the tbusy flag when finished otherwise it sets
        !           222: the 'lp->tx_full' flag.
        !           223: 
        !           224: The interrupt handler has exclusive control over the Rx ring and records stats
        !           225: from the Tx ring.  After reaping the stats, it marks the Tx queue entry as
        !           226: empty by incrementing the dirty_tx mark. Iff the 'lp->tx_full' flag is set, it
        !           227: clears both the tx_full and tbusy flags.
        !           228: 
        !           229: IV. Notes
        !           230: 
        !           231: IVb. References
        !           232: 
        !           233: Preliminary VT86C100A manual from http://www.via.com.tw/
        !           234: http://cesdis.gsfc.nasa.gov/linux/misc/100mbps.html
        !           235: http://cesdis.gsfc.nasa.gov/linux/misc/NWay.html
        !           236: 
        !           237: IVc. Errata
        !           238: 
        !           239: The VT86C100A manual is not reliable information.
        !           240: The chip does not handle unaligned transmit or receive buffers, resulting
        !           241: in significant performance degradation for bounce buffer copies on transmit
        !           242: and unaligned IP headers on receive.
        !           243: The chip does not pad to minimum transmit length.
        !           244: 
        !           245: */
        !           246: 
        !           247: 
        !           248: 
        !           249: /* This table drives the PCI probe routines.  It's mostly boilerplate in all
        !           250:    of the drivers, and will likely be provided by some future kernel.
        !           251:    Note the matching code -- the first table entry matchs all 56** cards but
        !           252:    second only the 1234 card.
        !           253: */
        !           254: enum pci_flags_bit {
        !           255:        PCI_USES_IO=1, PCI_USES_MEM=2, PCI_USES_MASTER=4,
        !           256:        PCI_ADDR0=0x10<<0, PCI_ADDR1=0x10<<1, PCI_ADDR2=0x10<<2, PCI_ADDR3=0x10<<3,
        !           257: };
        !           258: struct pci_id_info {
        !           259:        const char *name;
        !           260:        u16     vendor_id, device_id, device_id_mask, flags;
        !           261:        int io_size;
        !           262:        struct device *(*probe1)(int pci_bus, int pci_devfn, struct device *dev,
        !           263:                                                         long ioaddr, int irq, int chip_idx, int fnd_cnt);
        !           264: };
        !           265: 
        !           266: static struct device *via_probe1(int pci_bus, int pci_devfn,
        !           267:                                                                 struct device *dev, long ioaddr, int irq,
        !           268:                                                                 int chp_idx, int fnd_cnt);
        !           269: 
        !           270: static struct pci_id_info pci_tbl[] = {
        !           271:        { "VIA VT86C100A Rhine-II", 0x1106, 0x6100, 0xffff,
        !           272:          PCI_USES_MEM|PCI_USES_IO|PCI_USES_MEM|PCI_USES_MASTER, 128, via_probe1},
        !           273:        { "VIA VT3043 Rhine", 0x1106, 0x3043, 0xffff,
        !           274:          PCI_USES_IO|PCI_USES_MEM|PCI_USES_MASTER, 128, via_probe1},
        !           275:        {0,},                                           /* 0 terminated list. */
        !           276: };
        !           277: 
        !           278: 
        !           279: /* A chip capabilities table, matching the entries in pci_tbl[] above. */
        !           280: enum chip_capability_flags {CanHaveMII=1, };
        !           281: struct chip_info {
        !           282:        int io_size;
        !           283:        int flags;
        !           284: } static cap_tbl[] = {
        !           285:        {128, CanHaveMII, },
        !           286:        {128, CanHaveMII, },
        !           287: };
        !           288: 
        !           289: 
        !           290: /* Offsets to the device registers.
        !           291: */
        !           292: enum register_offsets {
        !           293:        StationAddr=0x00, RxConfig=0x06, TxConfig=0x07, ChipCmd=0x08,
        !           294:        IntrStatus=0x0C, IntrEnable=0x0E,
        !           295:        MulticastFilter0=0x10, MulticastFilter1=0x14,
        !           296:        RxRingPtr=0x18, TxRingPtr=0x1C,
        !           297:        MIIPhyAddr=0x6C, MIIStatus=0x6D, PCIConfig=0x6E,
        !           298:        MIICmd=0x70, MIIRegAddr=0x71, MIIData=0x72,
        !           299:        Config=0x78, RxMissed=0x7C, RxCRCErrs=0x7E,
        !           300: };
        !           301: 
        !           302: /* Bits in the interrupt status/mask registers. */
        !           303: enum intr_status_bits {
        !           304:        IntrRxDone=0x0001, IntrRxErr=0x0004, IntrRxEmpty=0x0020,
        !           305:        IntrTxDone=0x0002, IntrTxAbort=0x0008, IntrTxUnderrun=0x0010,
        !           306:        IntrPCIErr=0x0040,
        !           307:        IntrStatsMax=0x0080, IntrRxEarly=0x0100, IntrMIIChange=0x0200,
        !           308:        IntrRxOverflow=0x0400, IntrRxDropped=0x0800, IntrRxNoBuf=0x1000,
        !           309:        IntrTxAborted=0x2000, IntrLinkChange=0x4000,
        !           310:        IntrRxWakeUp=0x8000,
        !           311:        IntrNormalSummary=0x0003, IntrAbnormalSummary=0x8260,
        !           312: };
        !           313: 
        !           314: 
        !           315: /* The Rx and Tx buffer descriptors. */
        !           316: struct rx_desc {
        !           317:        u16 rx_status;
        !           318:        u16 rx_length;
        !           319:        u32 desc_length;
        !           320:        u32 addr;
        !           321:        u32 next_desc;
        !           322: };
        !           323: struct tx_desc {
        !           324:        u16 tx_status;
        !           325:        u16 tx_own;
        !           326:        u32 desc_length;
        !           327:        u32 addr;
        !           328:        u32 next_desc;
        !           329: };
        !           330: 
        !           331: /* Bits in *_desc.status */
        !           332: enum rx_status_bits {
        !           333:        RxDescOwn=0x80000000, RxOK=0x8000, RxWholePkt=0x0300, RxErr=0x008F};
        !           334: enum desc_status_bits {
        !           335:        DescOwn=0x8000, DescEndPacket=0x4000, DescIntr=0x1000,
        !           336: };
        !           337: 
        !           338: /* Bits in ChipCmd. */
        !           339: enum chip_cmd_bits {
        !           340:        CmdInit=0x0001, CmdStart=0x0002, CmdStop=0x0004, CmdRxOn=0x0008,
        !           341:        CmdTxOn=0x0010, CmdTxDemand=0x0020, CmdRxDemand=0x0040,
        !           342:        CmdEarlyRx=0x0100, CmdEarlyTx=0x0200, CmdFDuplex=0x0400,
        !           343:        CmdNoTxPoll=0x0800, CmdReset=0x8000,
        !           344: };
        !           345: 
        !           346: struct netdev_private {
        !           347:        /* Descriptor rings first for alignment. */
        !           348:        struct rx_desc rx_ring[RX_RING_SIZE];
        !           349:        struct tx_desc tx_ring[TX_RING_SIZE];
        !           350:        /* The addresses of receive-in-place skbuffs. */
        !           351:        struct sk_buff* rx_skbuff[RX_RING_SIZE];
        !           352:        /* The saved address of a sent-in-place packet/buffer, for later free(). */
        !           353:        struct sk_buff* tx_skbuff[TX_RING_SIZE];
        !           354:        unsigned char *tx_buf[TX_RING_SIZE];    /* Tx bounce buffers */
        !           355:        unsigned char *tx_bufs;                         /* Tx bounce buffer region. */
        !           356:        struct device *next_module;                     /* Link for devices of this type. */
        !           357:        struct net_device_stats stats;
        !           358:        struct timer_list timer;        /* Media monitoring timer. */
        !           359:        unsigned char pci_bus, pci_devfn;
        !           360:        /* Frequently used values: keep some adjacent for cache effect. */
        !           361:        int chip_id;
        !           362:        long in_interrupt;                      /* Word-long for SMP locks. */
        !           363:        struct rx_desc *rx_head_desc;
        !           364:        unsigned int cur_rx, dirty_rx;          /* Producer/consumer ring indices */
        !           365:        unsigned int cur_tx, dirty_tx;
        !           366:        unsigned int rx_buf_sz;                         /* Based on MTU+slack. */
        !           367:        u16 chip_cmd;                                           /* Current setting for ChipCmd */
        !           368:        unsigned int tx_full:1;                         /* The Tx queue is full. */
        !           369:        /* These values are keep track of the transceiver/media in use. */
        !           370:        unsigned int full_duplex:1;                     /* Full-duplex operation requested. */
        !           371:        unsigned int duplex_lock:1;
        !           372:        unsigned int medialock:1;                       /* Do not sense media. */
        !           373:        unsigned int default_port:4;            /* Last dev->if_port value. */
        !           374:        u8 tx_thresh, rx_thresh;
        !           375:        /* MII transceiver section. */
        !           376:        int mii_cnt;                                            /* MII device addresses. */
        !           377:        u16 advertising;                                        /* NWay media advertisement */
        !           378:        unsigned char phys[2];                          /* MII device addresses. */
        !           379: };
        !           380: 
        !           381: static int  mdio_read(struct device *dev, int phy_id, int location);
        !           382: static void mdio_write(struct device *dev, int phy_id, int location, int value);
        !           383: static int  netdev_open(struct device *dev);
        !           384: static void check_duplex(struct device *dev);
        !           385: static void netdev_timer(unsigned long data);
        !           386: static void tx_timeout(struct device *dev);
        !           387: static void init_ring(struct device *dev);
        !           388: static int  start_tx(struct sk_buff *skb, struct device *dev);
        !           389: static void intr_handler(int irq, void *dev_instance, struct pt_regs *regs);
        !           390: static int  netdev_rx(struct device *dev);
        !           391: static void netdev_error(struct device *dev, int intr_status);
        !           392: static void set_rx_mode(struct device *dev);
        !           393: static struct net_device_stats *get_stats(struct device *dev);
        !           394: static int mii_ioctl(struct device *dev, struct ifreq *rq, int cmd);
        !           395: static int  netdev_close(struct device *dev);
        !           396: 
        !           397: 
        !           398: 
        !           399: /* A list of our installed devices, for removing the driver module. */
        !           400: static struct device *root_net_dev = NULL;
        !           401: 
        !           402: /* Ideally we would detect all network cards in slot order.  That would
        !           403:    be best done a central PCI probe dispatch, which wouldn't work
        !           404:    well when dynamically adding drivers.  So instead we detect just the
        !           405:    cards we know about in slot order. */
        !           406: 
        !           407: static int pci_etherdev_probe(struct device *dev, struct pci_id_info pci_tbl[])
        !           408: {
        !           409:        int cards_found = 0;
        !           410:        int pci_index = 0;
        !           411:        unsigned char pci_bus, pci_device_fn;
        !           412: 
        !           413:        if ( ! pcibios_present())
        !           414:                return -ENODEV;
        !           415: 
        !           416:        for (;pci_index < 0xff; pci_index++) {
        !           417:                u16 vendor, device, pci_command, new_command;
        !           418:                int chip_idx, irq;
        !           419:                long pciaddr;
        !           420:                long ioaddr;
        !           421: 
        !           422:                if (pcibios_find_class (PCI_CLASS_NETWORK_ETHERNET << 8, pci_index,
        !           423:                                                                &pci_bus, &pci_device_fn)
        !           424:                        != PCIBIOS_SUCCESSFUL)
        !           425:                        break;
        !           426:                pcibios_read_config_word(pci_bus, pci_device_fn,
        !           427:                                                                 PCI_VENDOR_ID, &vendor);
        !           428:                pcibios_read_config_word(pci_bus, pci_device_fn,
        !           429:                                                                 PCI_DEVICE_ID, &device);
        !           430: 
        !           431:                for (chip_idx = 0; pci_tbl[chip_idx].vendor_id; chip_idx++)
        !           432:                        if (vendor == pci_tbl[chip_idx].vendor_id
        !           433:                                && (device & pci_tbl[chip_idx].device_id_mask) ==
        !           434:                                pci_tbl[chip_idx].device_id)
        !           435:                                break;
        !           436:                if (pci_tbl[chip_idx].vendor_id == 0)           /* Compiled out! */
        !           437:                        continue;
        !           438: 
        !           439:                {
        !           440: #if defined(PCI_SUPPORT_VER2)
        !           441:                        struct pci_dev *pdev = pci_find_slot(pci_bus, pci_device_fn);
        !           442: #ifdef VIA_USE_IO
        !           443:                        pciaddr = pdev->base_address[0];
        !           444: #else
        !           445:                        pciaddr = pdev->base_address[1];
        !           446: #endif
        !           447:                        irq = pdev->irq;
        !           448: #else
        !           449:                        u32 pci_memaddr;
        !           450:                        u8 pci_irq_line;
        !           451:                        pcibios_read_config_byte(pci_bus, pci_device_fn,
        !           452:                                                                         PCI_INTERRUPT_LINE, &pci_irq_line);
        !           453: #ifdef VIA_USE_IO
        !           454:                        pcibios_read_config_dword(pci_bus, pci_device_fn,
        !           455:                                                                          PCI_BASE_ADDRESS_0, &pci_memaddr);
        !           456:                        pciaddr = pci_memaddr;
        !           457: #else
        !           458:                        pcibios_read_config_dword(pci_bus, pci_device_fn,
        !           459:                                                                          PCI_BASE_ADDRESS_1, &pci_memaddr);
        !           460:                        pciaddr = pci_memaddr;
        !           461: #endif
        !           462:                        irq = pci_irq_line;
        !           463: #endif
        !           464:                }
        !           465: 
        !           466:                if (debug > 2)
        !           467:                        printk(KERN_INFO "Found %s at PCI address %#lx, IRQ %d.\n",
        !           468:                                   pci_tbl[chip_idx].name, pciaddr, irq);
        !           469: 
        !           470:                if (pci_tbl[chip_idx].flags & PCI_USES_IO) {
        !           471:                        if (check_region(pciaddr, pci_tbl[chip_idx].io_size))
        !           472:                                continue;
        !           473:                        ioaddr = pciaddr & ~3;
        !           474:                } else if ((ioaddr = (long)ioremap(pciaddr & ~0xf,
        !           475:                                                                                 pci_tbl[chip_idx].io_size)) == 0) {
        !           476:                        printk(KERN_INFO "Failed to map PCI address %#lx.\n",
        !           477:                                   pciaddr);
        !           478:                        continue;
        !           479:                }
        !           480: 
        !           481:                pcibios_read_config_word(pci_bus, pci_device_fn,
        !           482:                                                                 PCI_COMMAND, &pci_command);
        !           483:                new_command = pci_command | (pci_tbl[chip_idx].flags & 7);
        !           484:                if (pci_command != new_command) {
        !           485:                        printk(KERN_INFO "  The PCI BIOS has not enabled the"
        !           486:                                   " device at %d/%d!  Updating PCI command %4.4x->%4.4x.\n",
        !           487:                                   pci_bus, pci_device_fn, pci_command, new_command);
        !           488:                        pcibios_write_config_word(pci_bus, pci_device_fn,
        !           489:                                                                          PCI_COMMAND, new_command);
        !           490:                }
        !           491: 
        !           492:                dev = pci_tbl[chip_idx].probe1(pci_bus, pci_device_fn, dev, ioaddr,
        !           493:                                                                           irq, chip_idx, cards_found);
        !           494: 
        !           495:                if (dev  && (pci_tbl[chip_idx].flags & PCI_COMMAND_MASTER)) {
        !           496:                        u8 pci_latency;
        !           497:                        pcibios_read_config_byte(pci_bus, pci_device_fn,
        !           498:                                                                         PCI_LATENCY_TIMER, &pci_latency);
        !           499:                        if (pci_latency < min_pci_latency) {
        !           500:                                printk(KERN_INFO "  PCI latency timer (CFLT) is "
        !           501:                                           "unreasonably low at %d.  Setting to %d clocks.\n",
        !           502:                                           pci_latency, min_pci_latency);
        !           503:                                pcibios_write_config_byte(pci_bus, pci_device_fn,
        !           504:                                                                                  PCI_LATENCY_TIMER, min_pci_latency);
        !           505:                        }
        !           506:                }
        !           507:                dev = 0;
        !           508:                cards_found++;
        !           509:        }
        !           510: 
        !           511:        return cards_found ? 0 : -ENODEV;
        !           512: }
        !           513: 
        !           514: #ifndef MODULE
        !           515: int via_rhine_probe(struct device *dev)
        !           516: {
        !           517:        return pci_etherdev_probe(dev, pci_tbl);
        !           518: }
        !           519: #endif
        !           520: 
        !           521: static struct device *via_probe1(int pci_bus, int pci_devfn,
        !           522:                                                                 struct device *dev, long ioaddr, int irq,
        !           523:                                                                 int chip_id, int card_idx)
        !           524: {
        !           525:        static int did_version = 0;             /* Already printed version info */
        !           526:        struct netdev_private *np;
        !           527:        int i, option = card_idx < MAX_UNITS ? options[card_idx] : 0;
        !           528: 
        !           529:        if (debug > 0 && did_version++ == 0)
        !           530:                printk(KERN_INFO "%s" KERN_INFO "%s", versionA, versionB);
        !           531: 
        !           532:        dev = init_etherdev(dev, 0);
        !           533: 
        !           534:        printk(KERN_INFO "%s: %s at 0x%lx, ",
        !           535:                   dev->name, pci_tbl[chip_id].name, ioaddr);
        !           536: 
        !           537:        /* Ideally we would be read the EEPROM but access may be locked. */
        !           538:        for (i = 0; i <6; i++)
        !           539:                dev->dev_addr[i] = readb(ioaddr + StationAddr + i);
        !           540:        for (i = 0; i < 5; i++)
        !           541:                        printk("%2.2x:", dev->dev_addr[i]);
        !           542:        printk("%2.2x, IRQ %d.\n", dev->dev_addr[i], irq);
        !           543: 
        !           544: #ifdef VIA_USE_IO
        !           545:        request_region(ioaddr, pci_tbl[chip_id].io_size, dev->name);
        !           546: #endif
        !           547: 
        !           548:        /* Reset the chip to erase previous misconfiguration. */
        !           549:        writew(CmdReset, ioaddr + ChipCmd);
        !           550: 
        !           551:        dev->base_addr = ioaddr;
        !           552:        dev->irq = irq;
        !           553: 
        !           554:        /* Make certain the descriptor lists are cache-aligned. */
        !           555:        np = (void *)(((long)kmalloc(sizeof(*np), GFP_KERNEL) + 31) & ~31);
        !           556:        memset(np, 0, sizeof(*np));
        !           557:        dev->priv = np;
        !           558: 
        !           559:        np->next_module = root_net_dev;
        !           560:        root_net_dev = dev;
        !           561: 
        !           562:        np->pci_bus = pci_bus;
        !           563:        np->pci_devfn = pci_devfn;
        !           564:        np->chip_id = chip_id;
        !           565: 
        !           566:        if (dev->mem_start)
        !           567:                option = dev->mem_start;
        !           568: 
        !           569:        /* The lower four bits are the media type. */
        !           570:        if (option > 0) {
        !           571:                if (option & 0x200)
        !           572:                        np->full_duplex = 1;
        !           573:                np->default_port = option & 15;
        !           574:                if (np->default_port)
        !           575:                        np->medialock = 1;
        !           576:        }
        !           577:        if (card_idx < MAX_UNITS  &&  full_duplex[card_idx] > 0)
        !           578:                np->full_duplex = 1;
        !           579: 
        !           580:        if (np->full_duplex)
        !           581:                np->duplex_lock = 1;
        !           582: 
        !           583:        /* The chip-specific entries in the device structure. */
        !           584:        dev->open = &netdev_open;
        !           585:        dev->hard_start_xmit = &start_tx;
        !           586:        dev->stop = &netdev_close;
        !           587:        dev->get_stats = &get_stats;
        !           588:        dev->set_multicast_list = &set_rx_mode;
        !           589:        dev->do_ioctl = &mii_ioctl;
        !           590: 
        !           591:        if (cap_tbl[np->chip_id].flags & CanHaveMII) {
        !           592:                int phy, phy_idx = 0;
        !           593:                np->phys[0] = 1;                /* Standard for this chip. */
        !           594:                for (phy = 1; phy < 32 && phy_idx < 4; phy++) {
        !           595:                        int mii_status = mdio_read(dev, phy, 1);
        !           596:                        if (mii_status != 0xffff  &&  mii_status != 0x0000) {
        !           597:                                np->phys[phy_idx++] = phy;
        !           598:                                np->advertising = mdio_read(dev, phy, 4);
        !           599:                                printk(KERN_INFO "%s: MII PHY found at address %d, status "
        !           600:                                           "0x%4.4x advertising %4.4x Link %4.4x.\n",
        !           601:                                           dev->name, phy, mii_status, np->advertising,
        !           602:                                           mdio_read(dev, phy, 5));
        !           603:                        }
        !           604:                }
        !           605:                np->mii_cnt = phy_idx;
        !           606:        }
        !           607: 
        !           608:        return dev;
        !           609: }
        !           610: 
        !           611: 
        !           612: /* Read and write over the MII Management Data I/O (MDIO) interface. */
        !           613: 
        !           614: static int mdio_read(struct device *dev, int phy_id, int regnum)
        !           615: {
        !           616:        long ioaddr = dev->base_addr;
        !           617:        int boguscnt = 1024;
        !           618: 
        !           619:        /* Wait for a previous command to complete. */
        !           620:        while ((readb(ioaddr + MIICmd) & 0x60) && --boguscnt > 0)
        !           621:                ;
        !           622:        writeb(0x00, ioaddr + MIICmd);
        !           623:        writeb(phy_id, ioaddr + MIIPhyAddr);
        !           624:        writeb(regnum, ioaddr + MIIRegAddr);
        !           625:        writeb(0x40, ioaddr + MIICmd);                  /* Trigger read */
        !           626:        boguscnt = 1024;
        !           627:        while ((readb(ioaddr + MIICmd) & 0x40) && --boguscnt > 0)
        !           628:                ;
        !           629:        return readw(ioaddr + MIIData);
        !           630: }
        !           631: 
        !           632: static void mdio_write(struct device *dev, int phy_id, int regnum, int value)
        !           633: {
        !           634:        long ioaddr = dev->base_addr;
        !           635:        int boguscnt = 1024;
        !           636: 
        !           637:        /* Wait for a previous command to complete. */
        !           638:        while ((readb(ioaddr + MIICmd) & 0x60) && --boguscnt > 0)
        !           639:                ;
        !           640:        writeb(0x00, ioaddr + MIICmd);
        !           641:        writeb(phy_id, ioaddr + MIIPhyAddr);
        !           642:        writeb(regnum, ioaddr + MIIRegAddr);
        !           643:        writew(value, ioaddr + MIIData);
        !           644:        writeb(0x20, ioaddr + MIICmd);                  /* Trigger write. */
        !           645:        return;
        !           646: }
        !           647: 
        !           648: 
        !           649: static int netdev_open(struct device *dev)
        !           650: {
        !           651:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           652:        long ioaddr = dev->base_addr;
        !           653:        int i;
        !           654: 
        !           655:        /* Reset the chip. */
        !           656:        writew(CmdReset, ioaddr + ChipCmd);
        !           657: 
        !           658:        if (request_irq(dev->irq, &intr_handler, SA_SHIRQ, dev->name, dev))
        !           659:                return -EAGAIN;
        !           660: 
        !           661:        if (debug > 1)
        !           662:                printk(KERN_DEBUG "%s: netdev_open() irq %d.\n",
        !           663:                           dev->name, dev->irq);
        !           664: 
        !           665:        MOD_INC_USE_COUNT;
        !           666: 
        !           667:        init_ring(dev);
        !           668: 
        !           669:        writel(virt_to_bus(np->rx_ring), ioaddr + RxRingPtr);
        !           670:        writel(virt_to_bus(np->tx_ring), ioaddr + TxRingPtr);
        !           671: 
        !           672:        for (i = 0; i < 6; i++)
        !           673:                writeb(dev->dev_addr[i], ioaddr + StationAddr + i);
        !           674: 
        !           675:        /* Initialize other registers. */
        !           676:        writew(0x0006, ioaddr + PCIConfig);     /* Tune configuration??? */
        !           677:        /* Configure the FIFO thresholds. */
        !           678:        writeb(0x20, ioaddr + TxConfig);        /* Initial threshold 32 bytes */
        !           679:        np->tx_thresh = 0x20;
        !           680:        np->rx_thresh = 0x60;                           /* Written in set_rx_mode(). */
        !           681: 
        !           682:        if (dev->if_port == 0)
        !           683:                dev->if_port = np->default_port;
        !           684: 
        !           685:        dev->tbusy = 0;
        !           686:        dev->interrupt = 0;
        !           687:        np->in_interrupt = 0;
        !           688: 
        !           689:        set_rx_mode(dev);
        !           690: 
        !           691:        dev->start = 1;
        !           692: 
        !           693:        /* Enable interrupts by setting the interrupt mask. */
        !           694:        writew(IntrRxDone | IntrRxErr | IntrRxEmpty| IntrRxOverflow| IntrRxDropped|
        !           695:                   IntrTxDone | IntrTxAbort | IntrTxUnderrun |
        !           696:                   IntrPCIErr | IntrStatsMax | IntrLinkChange | IntrMIIChange,
        !           697:                   ioaddr + IntrEnable);
        !           698: 
        !           699:        np->chip_cmd = CmdStart|CmdTxOn|CmdRxOn|CmdNoTxPoll;
        !           700:        writew(np->chip_cmd, ioaddr + ChipCmd);
        !           701: 
        !           702:        check_duplex(dev);
        !           703: 
        !           704:        if (debug > 2)
        !           705:                printk(KERN_DEBUG "%s: Done netdev_open(), status %4.4x "
        !           706:                           "MII status: %4.4x.\n",
        !           707:                           dev->name, readw(ioaddr + ChipCmd),
        !           708:                           mdio_read(dev, np->phys[0], 1));
        !           709: 
        !           710:        /* Set the timer to check for link beat. */
        !           711:        init_timer(&np->timer);
        !           712:        np->timer.expires = RUN_AT(1);
        !           713:        np->timer.data = (unsigned long)dev;
        !           714:        np->timer.function = &netdev_timer;                             /* timer handler */
        !           715:        add_timer(&np->timer);
        !           716: 
        !           717:        return 0;
        !           718: }
        !           719: 
        !           720: static void check_duplex(struct device *dev)
        !           721: {
        !           722:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           723:        long ioaddr = dev->base_addr;
        !           724:        int mii_reg5 = mdio_read(dev, np->phys[0], 5);
        !           725:        int duplex;
        !           726: 
        !           727:        if (np->duplex_lock  ||  mii_reg5 == 0xffff)
        !           728:                return;
        !           729:        duplex = (mii_reg5 & 0x0100) || (mii_reg5 & 0x01C0) == 0x0040;
        !           730:        if (np->full_duplex != duplex) {
        !           731:                np->full_duplex = duplex;
        !           732:                if (debug)
        !           733:                        printk(KERN_INFO "%s: Setting %s-duplex based on MII #%d link"
        !           734:                                   " partner capability of %4.4x.\n", dev->name,
        !           735:                                   duplex ? "full" : "half", np->phys[0], mii_reg5);
        !           736:                if (duplex)
        !           737:                        np->chip_cmd |= CmdFDuplex;
        !           738:                else
        !           739:                        np->chip_cmd &= ~CmdFDuplex;
        !           740:                writew(np->chip_cmd, ioaddr + ChipCmd);
        !           741:        }
        !           742: }
        !           743: 
        !           744: static void netdev_timer(unsigned long data)
        !           745: {
        !           746:        struct device *dev = (struct device *)data;
        !           747:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           748:        long ioaddr = dev->base_addr;
        !           749:        int next_tick = 10*HZ;
        !           750: 
        !           751:        if (debug > 3) {
        !           752:                printk(KERN_DEBUG "%s: VIA Rhine monitor tick, status %4.4x.\n",
        !           753:                           dev->name, readw(ioaddr + IntrStatus));
        !           754:        }
        !           755:        check_duplex(dev);
        !           756: 
        !           757:        np->timer.expires = RUN_AT(next_tick);
        !           758:        add_timer(&np->timer);
        !           759: }
        !           760: 
        !           761: static void tx_timeout(struct device *dev)
        !           762: {
        !           763:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           764:        long ioaddr = dev->base_addr;
        !           765: 
        !           766:        printk(KERN_WARNING "%s: Transmit timed out, status %4.4x, PHY status "
        !           767:                   "%4.4x, resetting...\n",
        !           768:                   dev->name, readw(ioaddr + IntrStatus),
        !           769:                   mdio_read(dev, np->phys[0], 1));
        !           770: 
        !           771:   /* Perhaps we should reinitialize the hardware here. */
        !           772:   dev->if_port = 0;
        !           773:   /* Stop and restart the chip's Tx processes . */
        !           774: 
        !           775:   /* Trigger an immediate transmit demand. */
        !           776: 
        !           777:   dev->trans_start = jiffies;
        !           778:   np->stats.tx_errors++;
        !           779:   return;
        !           780: }
        !           781: 
        !           782: 
        !           783: /* Initialize the Rx and Tx rings, along with various 'dev' bits. */
        !           784: static void init_ring(struct device *dev)
        !           785: {
        !           786:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           787:        int i;
        !           788: 
        !           789:        np->tx_full = 0;
        !           790:        np->cur_rx = np->cur_tx = 0;
        !           791:        np->dirty_rx = np->dirty_tx = 0;
        !           792: 
        !           793:        np->rx_buf_sz = (dev->mtu <= 1500 ? PKT_BUF_SZ : dev->mtu + 32);
        !           794:        np->rx_head_desc = &np->rx_ring[0];
        !           795: 
        !           796:        for (i = 0; i < RX_RING_SIZE; i++) {
        !           797:                np->rx_ring[i].rx_status = 0;
        !           798:                np->rx_ring[i].rx_length = 0;
        !           799:                np->rx_ring[i].desc_length = np->rx_buf_sz;
        !           800:                np->rx_ring[i].next_desc = virt_to_bus(&np->rx_ring[i+1]);
        !           801:                np->rx_skbuff[i] = 0;
        !           802:        }
        !           803:        /* Mark the last entry as wrapping the ring. */
        !           804:        np->rx_ring[i-1].next_desc = virt_to_bus(&np->rx_ring[0]);
        !           805: 
        !           806:        /* Fill in the Rx buffers. */
        !           807:        for (i = 0; i < RX_RING_SIZE; i++) {
        !           808:                struct sk_buff *skb = dev_alloc_skb(np->rx_buf_sz);
        !           809:                np->rx_skbuff[i] = skb;
        !           810:                if (skb == NULL)
        !           811:                        break;
        !           812:                skb->dev = dev;                 /* Mark as being used by this device. */
        !           813:                np->rx_ring[i].addr = virt_to_bus(skb->tail);
        !           814:                np->rx_ring[i].rx_status = 0;
        !           815:                np->rx_ring[i].rx_length = DescOwn;
        !           816:        }
        !           817:        np->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
        !           818: 
        !           819:        for (i = 0; i < TX_RING_SIZE; i++) {
        !           820:                np->tx_skbuff[i] = 0;
        !           821:                np->tx_ring[i].tx_own = 0;
        !           822:                np->tx_ring[i].desc_length = 0x00e08000;
        !           823:                np->tx_ring[i].next_desc = virt_to_bus(&np->tx_ring[i+1]);
        !           824:                np->tx_buf[i] = kmalloc(PKT_BUF_SZ, GFP_KERNEL);
        !           825:        }
        !           826:        np->tx_ring[i-1].next_desc = virt_to_bus(&np->tx_ring[0]);
        !           827: 
        !           828:        return;
        !           829: }
        !           830: 
        !           831: static int start_tx(struct sk_buff *skb, struct device *dev)
        !           832: {
        !           833:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           834:        unsigned entry;
        !           835: 
        !           836:        /* Block a timer-based transmit from overlapping.  This could better be
        !           837:           done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
        !           838:        if (test_and_set_bit(0, (void*)&dev->tbusy) != 0) {
        !           839:                if (jiffies - dev->trans_start < TX_TIMEOUT)
        !           840:                        return 1;
        !           841:                tx_timeout(dev);
        !           842:                return 1;
        !           843:        }
        !           844: 
        !           845:        /* Caution: the write order is important here, set the field
        !           846:           with the "ownership" bits last. */
        !           847: 
        !           848:        /* Calculate the next Tx descriptor entry. */
        !           849:        entry = np->cur_tx % TX_RING_SIZE;
        !           850: 
        !           851:        np->tx_skbuff[entry] = skb;
        !           852: 
        !           853:        if ((long)skb->data & 3) {                      /* Must use alignment buffer. */
        !           854:                if (np->tx_buf[entry] == NULL &&
        !           855:                        (np->tx_buf[entry] = kmalloc(PKT_BUF_SZ, GFP_KERNEL)) == NULL)
        !           856:                        return 1;
        !           857:                memcpy(np->tx_buf[entry], skb->data, skb->len);
        !           858:                np->tx_ring[entry].addr = virt_to_bus(np->tx_buf[entry]);
        !           859:        } else
        !           860:                np->tx_ring[entry].addr = virt_to_bus(skb->data);
        !           861: 
        !           862:        np->tx_ring[entry].desc_length = 0x00E08000 |
        !           863:                (skb->len >= ETH_ZLEN ? skb->len : ETH_ZLEN);
        !           864:        np->tx_ring[entry].tx_own = DescOwn;
        !           865: 
        !           866:        np->cur_tx++;
        !           867: 
        !           868:        /* Non-x86 Todo: explicitly flush cache lines here. */
        !           869: 
        !           870:        /* Wake the potentially-idle transmit channel. */
        !           871:        writew(CmdTxDemand | np->chip_cmd, dev->base_addr + ChipCmd);
        !           872: 
        !           873:        if (np->cur_tx - np->dirty_tx < TX_RING_SIZE - 1)
        !           874:                clear_bit(0, (void*)&dev->tbusy);               /* Typical path */
        !           875:        else
        !           876:                np->tx_full = 1;
        !           877:        dev->trans_start = jiffies;
        !           878: 
        !           879:        if (debug > 4) {
        !           880:                printk(KERN_DEBUG "%s: Transmit frame #%d queued in slot %d.\n",
        !           881:                           dev->name, np->cur_tx, entry);
        !           882:        }
        !           883:        return 0;
        !           884: }
        !           885: 
        !           886: /* The interrupt handler does all of the Rx thread work and cleans up
        !           887:    after the Tx thread. */
        !           888: static void intr_handler(int irq, void *dev_instance, struct pt_regs *rgs)
        !           889: {
        !           890:        struct device *dev = (struct device *)dev_instance;
        !           891:        struct netdev_private *np;
        !           892:        long ioaddr, boguscnt = max_interrupt_work;
        !           893: 
        !           894:        ioaddr = dev->base_addr;
        !           895:        np = (struct netdev_private *)dev->priv;
        !           896: #if defined(__i386__)
        !           897:        /* A lock to prevent simultaneous entry bug on Intel SMP machines. */
        !           898:        if (test_and_set_bit(0, (void*)&dev->interrupt)) {
        !           899:                printk(KERN_ERR"%s: SMP simultaneous entry of an interrupt handler.\n",
        !           900:                           dev->name);
        !           901:                dev->interrupt = 0;     /* Avoid halting machine. */
        !           902:                return;
        !           903:        }
        !           904: #else
        !           905:        if (dev->interrupt) {
        !           906:                printk(KERN_ERR "%s: Re-entering the interrupt handler.\n", dev->name);
        !           907:                return;
        !           908:        }
        !           909:        dev->interrupt = 1;
        !           910: #endif
        !           911: 
        !           912:        do {
        !           913:                u32 intr_status = readw(ioaddr + IntrStatus);
        !           914: 
        !           915:                /* Acknowledge all of the current interrupt sources ASAP. */
        !           916:                writew(intr_status & 0xffff, ioaddr + IntrStatus);
        !           917: 
        !           918:                if (debug > 4)
        !           919:                        printk(KERN_DEBUG "%s: Interrupt, status %4.4x.\n",
        !           920:                                   dev->name, intr_status);
        !           921: 
        !           922:                if (intr_status == 0)
        !           923:                        break;
        !           924: 
        !           925:                if (intr_status & (IntrRxDone | IntrRxErr | IntrRxDropped |
        !           926:                                                   IntrRxWakeUp | IntrRxEmpty | IntrRxNoBuf))
        !           927:                        netdev_rx(dev);
        !           928: 
        !           929:                for (; np->cur_tx - np->dirty_tx > 0; np->dirty_tx++) {
        !           930:                        int entry = np->dirty_tx % TX_RING_SIZE;
        !           931:                        int txstatus;
        !           932:                        if (np->tx_ring[entry].tx_own)
        !           933:                                break;
        !           934:                        txstatus = np->tx_ring[entry].tx_status;
        !           935:                        if (debug > 6)
        !           936:                                printk(KERN_DEBUG " Tx scavenge %d status %4.4x.\n",
        !           937:                                           entry, txstatus);
        !           938:                        if (txstatus & 0x8000) {
        !           939:                                if (debug > 1)
        !           940:                                        printk(KERN_DEBUG "%s: Transmit error, Tx status %4.4x.\n",
        !           941:                                                   dev->name, txstatus);
        !           942:                                np->stats.tx_errors++;
        !           943:                                if (txstatus & 0x0400) np->stats.tx_carrier_errors++;
        !           944:                                if (txstatus & 0x0200) np->stats.tx_window_errors++;
        !           945:                                if (txstatus & 0x0100) np->stats.tx_aborted_errors++;
        !           946:                                if (txstatus & 0x0080) np->stats.tx_heartbeat_errors++;
        !           947:                                if (txstatus & 0x0002) np->stats.tx_fifo_errors++;
        !           948: #ifdef ETHER_STATS
        !           949:                                if (txstatus & 0x0100) np->stats.collisions16++;
        !           950: #endif
        !           951:                                /* Transmitter restarted in 'abnormal' handler. */
        !           952:                        } else {
        !           953: #ifdef ETHER_STATS
        !           954:                                if (txstatus & 0x0001) np->stats.tx_deferred++;
        !           955: #endif
        !           956:                                np->stats.collisions += (txstatus >> 3) & 15;
        !           957: #if defined(NETSTATS_VER2)
        !           958:                                np->stats.tx_bytes += np->tx_ring[entry].desc_length & 0x7ff;
        !           959: #endif
        !           960:                                np->stats.tx_packets++;
        !           961:                        }
        !           962:                        /* Free the original skb. */
        !           963:                        dev_free_skb(np->tx_skbuff[entry]);
        !           964:                        np->tx_skbuff[entry] = 0;
        !           965:                }
        !           966:                if (np->tx_full && dev->tbusy
        !           967:                        && np->cur_tx - np->dirty_tx < TX_RING_SIZE - 4) {
        !           968:                        /* The ring is no longer full, clear tbusy. */
        !           969:                        np->tx_full = 0;
        !           970:                        clear_bit(0, (void*)&dev->tbusy);
        !           971:                        mark_bh(NET_BH);
        !           972:                }
        !           973: 
        !           974:                /* Abnormal error summary/uncommon events handlers. */
        !           975:                if (intr_status & (IntrPCIErr | IntrLinkChange | IntrMIIChange |
        !           976:                                                   IntrStatsMax | IntrTxAbort | IntrTxUnderrun))
        !           977:                        netdev_error(dev, intr_status);
        !           978: 
        !           979:                if (--boguscnt < 0) {
        !           980:                        printk(KERN_WARNING "%s: Too much work at interrupt, "
        !           981:                                   "status=0x%4.4x.\n",
        !           982:                                   dev->name, intr_status);
        !           983:                        break;
        !           984:                }
        !           985:        } while (1);
        !           986: 
        !           987:        if (debug > 3)
        !           988:                printk(KERN_DEBUG "%s: exiting interrupt, status=%#4.4x.\n",
        !           989:                           dev->name, readw(ioaddr + IntrStatus));
        !           990: 
        !           991: #if defined(__i386__)
        !           992:        clear_bit(0, (void*)&dev->interrupt);
        !           993: #else
        !           994:        dev->interrupt = 0;
        !           995: #endif
        !           996:        return;
        !           997: }
        !           998: 
        !           999: /* This routine is logically part of the interrupt handler, but isolated
        !          1000:    for clarity and better register allocation. */
        !          1001: static int netdev_rx(struct device *dev)
        !          1002: {
        !          1003:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1004:        int entry = np->cur_rx % RX_RING_SIZE;
        !          1005:        int boguscnt = np->dirty_rx + RX_RING_SIZE - np->cur_rx;
        !          1006: 
        !          1007:        if (debug > 4) {
        !          1008:                printk(KERN_DEBUG " In netdev_rx(), entry %d status %4.4x.\n",
        !          1009:                           entry, np->rx_head_desc->rx_length);
        !          1010:        }
        !          1011: 
        !          1012:        /* If EOP is set on the next entry, it's a new packet. Send it up. */
        !          1013:        while ( ! (np->rx_head_desc->rx_length & DescOwn)) {
        !          1014:                struct rx_desc *desc = np->rx_head_desc;
        !          1015:                int data_size = desc->rx_length;
        !          1016:                u16 desc_status = desc->rx_status;
        !          1017: 
        !          1018:                if (debug > 4)
        !          1019:                        printk(KERN_DEBUG "  netdev_rx() status is %4.4x.\n",
        !          1020:                                   desc_status);
        !          1021:                if (--boguscnt < 0)
        !          1022:                        break;
        !          1023:                if ( (desc_status & (RxWholePkt | RxErr)) !=  RxWholePkt) {
        !          1024:                        if ((desc_status & RxWholePkt) !=  RxWholePkt) {
        !          1025:                                printk(KERN_WARNING "%s: Oversized Ethernet frame spanned "
        !          1026:                                           "multiple buffers, entry %#x length %d status %4.4x!\n",
        !          1027:                                           dev->name, np->cur_rx, data_size, desc_status);
        !          1028:                                printk(KERN_WARNING "%s: Oversized Ethernet frame %p vs %p.\n",
        !          1029:                                           dev->name, np->rx_head_desc,
        !          1030:                                           &np->rx_ring[np->cur_rx % RX_RING_SIZE]);
        !          1031:                                np->stats.rx_length_errors++;
        !          1032:                        } else if (desc_status & RxErr) {
        !          1033:                                /* There was a error. */
        !          1034:                                if (debug > 2)
        !          1035:                                        printk(KERN_DEBUG "  netdev_rx() Rx error was %8.8x.\n",
        !          1036:                                                   desc_status);
        !          1037:                                np->stats.rx_errors++;
        !          1038:                                if (desc_status & 0x0030) np->stats.rx_length_errors++;
        !          1039:                                if (desc_status & 0x0048) np->stats.rx_fifo_errors++;
        !          1040:                                if (desc_status & 0x0004) np->stats.rx_frame_errors++;
        !          1041:                                if (desc_status & 0x0002) np->stats.rx_crc_errors++;
        !          1042:                        }
        !          1043:                } else {
        !          1044:                        struct sk_buff *skb;
        !          1045:                        /* Length should omit the CRC */
        !          1046:                        u16 pkt_len = data_size - 4;
        !          1047: 
        !          1048:                        /* Check if the packet is long enough to accept without copying
        !          1049:                           to a minimally-sized skbuff. */
        !          1050:                        if (pkt_len < rx_copybreak
        !          1051:                                && (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
        !          1052:                                skb->dev = dev;
        !          1053:                                skb_reserve(skb, 2);    /* 16 byte align the IP header */
        !          1054: #if ! defined(__alpha__) || USE_IP_COPYSUM             /* Avoid misaligned on Alpha */
        !          1055:                                eth_copy_and_sum(skb, bus_to_virt(desc->addr),
        !          1056:                                                                 pkt_len, 0);
        !          1057:                                skb_put(skb, pkt_len);
        !          1058: #else
        !          1059:                                memcpy(skb_put(skb,pkt_len), bus_to_virt(desc->addr), pkt_len);
        !          1060: #endif
        !          1061:                        } else {
        !          1062:                                skb_put(skb = np->rx_skbuff[entry], pkt_len);
        !          1063:                                np->rx_skbuff[entry] = NULL;
        !          1064:                        }
        !          1065:                        skb->protocol = eth_type_trans(skb, dev);
        !          1066:                        netif_rx(skb);
        !          1067:                        dev->last_rx = jiffies;
        !          1068:                        np->stats.rx_packets++;
        !          1069:                }
        !          1070:                entry = (++np->cur_rx) % RX_RING_SIZE;
        !          1071:                np->rx_head_desc = &np->rx_ring[entry];
        !          1072:        }
        !          1073: 
        !          1074:        /* Refill the Rx ring buffers. */
        !          1075:        for (; np->cur_rx - np->dirty_rx > 0; np->dirty_rx++) {
        !          1076:                struct sk_buff *skb;
        !          1077:                entry = np->dirty_rx % RX_RING_SIZE;
        !          1078:                if (np->rx_skbuff[entry] == NULL) {
        !          1079:                        skb = dev_alloc_skb(np->rx_buf_sz);
        !          1080:                        np->rx_skbuff[entry] = skb;
        !          1081:                        if (skb == NULL)
        !          1082:                                break;                  /* Better luck next round. */
        !          1083:                        skb->dev = dev;                 /* Mark as being used by this device. */
        !          1084:                        np->rx_ring[entry].addr = virt_to_bus(skb->tail);
        !          1085:                }
        !          1086:                np->rx_ring[entry].rx_status = 0;
        !          1087:                np->rx_ring[entry].rx_length = DescOwn;
        !          1088:        }
        !          1089: 
        !          1090:        /* Pre-emptively restart Rx engine. */
        !          1091:        writew(CmdRxDemand | np->chip_cmd, dev->base_addr + ChipCmd);
        !          1092:        return 0;
        !          1093: }
        !          1094: 
        !          1095: static void netdev_error(struct device *dev, int intr_status)
        !          1096: {
        !          1097:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1098:        long ioaddr = dev->base_addr;
        !          1099: 
        !          1100:        if (intr_status & (IntrMIIChange | IntrLinkChange)) {
        !          1101:                if (readb(ioaddr + MIIStatus) & 0x02)
        !          1102:                        /* Link failed, restart autonegotiation. */
        !          1103:                        mdio_write(dev, np->phys[0], 0, 0x3300);
        !          1104:                else
        !          1105:                        check_duplex(dev);
        !          1106:                if (debug)
        !          1107:                        printk(KERN_ERR "%s: MII status changed: Autonegotiation "
        !          1108:                                   "advertising %4.4x  partner %4.4x.\n", dev->name,
        !          1109:                           mdio_read(dev, np->phys[0], 4),
        !          1110:                           mdio_read(dev, np->phys[0], 5));
        !          1111:        }
        !          1112:        if (intr_status & IntrStatsMax) {
        !          1113:                np->stats.rx_crc_errors += readw(ioaddr + RxCRCErrs);
        !          1114:                np->stats.rx_missed_errors      += readw(ioaddr + RxMissed);
        !          1115:                writel(0, RxMissed);
        !          1116:        }
        !          1117:        if (intr_status & IntrTxAbort) {
        !          1118:                /* Stats counted in Tx-done handler, just restart Tx. */
        !          1119:                writew(CmdTxDemand | np->chip_cmd, dev->base_addr + ChipCmd);
        !          1120:        }
        !          1121:        if (intr_status & IntrTxUnderrun) {
        !          1122:                if (np->tx_thresh < 0xE0)
        !          1123:                        writeb(np->tx_thresh += 0x20, ioaddr + TxConfig);
        !          1124:                if (debug > 1)
        !          1125:                        printk(KERN_INFO "%s: Transmitter underrun, increasing Tx "
        !          1126:                                   "threshold setting to %2.2x.\n", dev->name, np->tx_thresh);
        !          1127:        }
        !          1128:        if ((intr_status & ~(IntrLinkChange|IntrStatsMax|IntrTxAbort)) && debug) {
        !          1129:                printk(KERN_ERR "%s: Something Wicked happened! %4.4x.\n",
        !          1130:                           dev->name, intr_status);
        !          1131:                /* Recovery for other fault sources not known. */
        !          1132:                writew(CmdTxDemand | np->chip_cmd, dev->base_addr + ChipCmd);
        !          1133:        }
        !          1134: }
        !          1135: 
        !          1136: static struct enet_statistics *get_stats(struct device *dev)
        !          1137: {
        !          1138:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1139:        long ioaddr = dev->base_addr;
        !          1140: 
        !          1141:        /* Nominally we should lock this segment of code for SMP, although
        !          1142:           the vulnerability window is very small and statistics are
        !          1143:           non-critical. */
        !          1144:        np->stats.rx_crc_errors += readw(ioaddr + RxCRCErrs);
        !          1145:        np->stats.rx_missed_errors      += readw(ioaddr + RxMissed);
        !          1146:        writel(0, RxMissed);
        !          1147: 
        !          1148:        return &np->stats;
        !          1149: }
        !          1150: 
        !          1151: /* The big-endian AUTODIN II ethernet CRC calculation.
        !          1152:    N.B. Do not use for bulk data, use a table-based routine instead.
        !          1153:    This is common code and should be moved to net/core/crc.c */
        !          1154: static unsigned const ethernet_polynomial = 0x04c11db7U;
        !          1155: static inline u32 ether_crc(int length, unsigned char *data)
        !          1156: {
        !          1157:     int crc = -1;
        !          1158: 
        !          1159:     while(--length >= 0) {
        !          1160:                unsigned char current_octet = *data++;
        !          1161:                int bit;
        !          1162:                for (bit = 0; bit < 8; bit++, current_octet >>= 1) {
        !          1163:                        crc = (crc << 1) ^
        !          1164:                                ((crc < 0) ^ (current_octet & 1) ? ethernet_polynomial : 0);
        !          1165:                }
        !          1166:     }
        !          1167:     return crc;
        !          1168: }
        !          1169: 
        !          1170: static void set_rx_mode(struct device *dev)
        !          1171: {
        !          1172:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1173:        long ioaddr = dev->base_addr;
        !          1174:        u32 mc_filter[2];                       /* Multicast hash filter */
        !          1175:        u8 rx_mode;                                     /* Note: 0x02=accept runt, 0x01=accept errs */
        !          1176: 
        !          1177:        if (dev->flags & IFF_PROMISC) {                 /* Set promiscuous. */
        !          1178:                /* Unconditionally log net taps. */
        !          1179:                printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
        !          1180:                rx_mode = 0x1C;
        !          1181:        } else if ((dev->mc_count > multicast_filter_limit)
        !          1182:                           ||  (dev->flags & IFF_ALLMULTI)) {
        !          1183:                /* Too many to match, or accept all multicasts. */
        !          1184:                rx_mode = 0x0C;
        !          1185:        } else {
        !          1186:                struct dev_mc_list *mclist;
        !          1187:                int i;
        !          1188:                memset(mc_filter, 0, sizeof(mc_filter));
        !          1189:                for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
        !          1190:                         i++, mclist = mclist->next) {
        !          1191:                        set_bit(ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26,
        !          1192:                                        mc_filter);
        !          1193:                }
        !          1194:                writel(mc_filter[0], ioaddr + MulticastFilter0);
        !          1195:                writel(mc_filter[1], ioaddr + MulticastFilter1);
        !          1196:                rx_mode = 0x0C;
        !          1197:        }
        !          1198:        writeb(np->rx_thresh | rx_mode, ioaddr + RxConfig);
        !          1199: }
        !          1200: 
        !          1201: static int mii_ioctl(struct device *dev, struct ifreq *rq, int cmd)
        !          1202: {
        !          1203:        u16 *data = (u16 *)&rq->ifr_data;
        !          1204: 
        !          1205:        switch(cmd) {
        !          1206:        case SIOCDEVPRIVATE:            /* Get the address of the PHY in use. */
        !          1207:                data[0] = ((struct netdev_private *)dev->priv)->phys[0] & 0x1f;
        !          1208:                /* Fall Through */
        !          1209:        case SIOCDEVPRIVATE+1:          /* Read the specified MII register. */
        !          1210:                data[3] = mdio_read(dev, data[0] & 0x1f, data[1] & 0x1f);
        !          1211:                return 0;
        !          1212:        case SIOCDEVPRIVATE+2:          /* Write the specified MII register */
        !          1213:                if (!suser())
        !          1214:                        return -EPERM;
        !          1215:                mdio_write(dev, data[0] & 0x1f, data[1] & 0x1f, data[2]);
        !          1216:                return 0;
        !          1217:        default:
        !          1218:                return -EOPNOTSUPP;
        !          1219:        }
        !          1220: }
        !          1221: 
        !          1222: static int netdev_close(struct device *dev)
        !          1223: {
        !          1224:        long ioaddr = dev->base_addr;
        !          1225:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1226:        int i;
        !          1227: 
        !          1228:        dev->start = 0;
        !          1229:        dev->tbusy = 1;
        !          1230: 
        !          1231:        if (debug > 1)
        !          1232:                printk(KERN_DEBUG "%s: Shutting down ethercard, status was %4.4x.\n",
        !          1233:                           dev->name, readw(ioaddr + ChipCmd));
        !          1234: 
        !          1235:        /* Disable interrupts by clearing the interrupt mask. */
        !          1236:        writew(0x0000, ioaddr + IntrEnable);
        !          1237: 
        !          1238:        /* Stop the chip's Tx and Rx processes. */
        !          1239:        writew(CmdStop, ioaddr + ChipCmd);
        !          1240: 
        !          1241:        del_timer(&np->timer);
        !          1242: 
        !          1243:        free_irq(dev->irq, dev);
        !          1244: 
        !          1245:        /* Free all the skbuffs in the Rx queue. */
        !          1246:        for (i = 0; i < RX_RING_SIZE; i++) {
        !          1247:                np->rx_ring[i].rx_length = 0;
        !          1248:                np->rx_ring[i].addr = 0xBADF00D0; /* An invalid address. */
        !          1249:                if (np->rx_skbuff[i]) {
        !          1250: #if LINUX_VERSION_CODE < 0x20100
        !          1251:                        np->rx_skbuff[i]->free = 1;
        !          1252: #endif
        !          1253:                        dev_free_skb(np->rx_skbuff[i]);
        !          1254:                }
        !          1255:                np->rx_skbuff[i] = 0;
        !          1256:        }
        !          1257:        for (i = 0; i < TX_RING_SIZE; i++) {
        !          1258:                if (np->tx_skbuff[i])
        !          1259:                        dev_free_skb(np->tx_skbuff[i]);
        !          1260:                np->tx_skbuff[i] = 0;
        !          1261:        }
        !          1262: 
        !          1263:        MOD_DEC_USE_COUNT;
        !          1264: 
        !          1265:        return 0;
        !          1266: }
        !          1267: 
        !          1268: 
        !          1269: #ifdef MODULE
        !          1270: int init_module(void)
        !          1271: {
        !          1272:        if (debug)                                      /* Emit version even if no cards detected. */
        !          1273:                printk(KERN_INFO "%s" KERN_INFO "%s", versionA, versionB);
        !          1274: #ifdef CARDBUS
        !          1275:        register_driver(&etherdev_ops);
        !          1276:        return 0;
        !          1277: #else
        !          1278:        return pci_etherdev_probe(NULL, pci_tbl);
        !          1279: #endif
        !          1280: }
        !          1281: 
        !          1282: void cleanup_module(void)
        !          1283: {
        !          1284: 
        !          1285: #ifdef CARDBUS
        !          1286:        unregister_driver(&etherdev_ops);
        !          1287: #endif
        !          1288: 
        !          1289:        /* No need to check MOD_IN_USE, as sys_delete_module() checks. */
        !          1290:        while (root_net_dev) {
        !          1291:                struct netdev_private *np =
        !          1292:                        (struct netdev_private *)(root_net_dev->priv);
        !          1293:                unregister_netdev(root_net_dev);
        !          1294: #ifdef VIA_USE_IO
        !          1295:                release_region(root_net_dev->base_addr, pci_tbl[np->chip_id].io_size);
        !          1296: #else
        !          1297:                iounmap((char *)(root_net_dev->base_addr));
        !          1298: #endif
        !          1299:                kfree(root_net_dev);
        !          1300:                root_net_dev = np->next_module;
        !          1301: #if 0
        !          1302:                kfree(np);                              /* Assumption: no struct realignment. */
        !          1303: #endif
        !          1304:        }
        !          1305: }
        !          1306: 
        !          1307: #endif  /* MODULE */
        !          1308: 
        !          1309: /*
        !          1310:  * Local variables:
        !          1311:  *  compile-command: "gcc -DMODULE -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -c via-rhine.c `[ -f /usr/include/linux/modversions.h ] && echo -DMODVERSIONS`"
        !          1312:  *  SMP-compile-command: "gcc -D__SMP__ -DMODULE -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -c via-rhine.c `[ -f /usr/include/linux/modversions.h ] && echo -DMODVERSIONS`"
        !          1313:  *  c-indent-level: 4
        !          1314:  *  c-basic-offset: 4
        !          1315:  *  tab-width: 4
        !          1316:  * End:
        !          1317:  */

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