Return to myson803.c CVS log

Up to [GnuMach] / Gnu-Mach / linux / src / drivers / net

Annotation of Gnu-Mach/linux/src/drivers/net/myson803.c, revision 1.1

1.1     ! root        1: /* myson803.c: A Linux device driver for the Myson mtd803 Ethernet chip. */
        !             2: /*
        !             3:        Written 1998-2003 by Donald Becker.
        !             4: 
        !             5:        This software may be used and distributed according to the terms of
        !             6:        the GNU General Public License (GPL), incorporated herein by reference.
        !             7:        Drivers based on or derived from this code fall under the GPL and must
        !             8:        retain the authorship, copyright and license notice.  This file is not
        !             9:        a complete program and may only be used when the entire operating
        !            10:        system is licensed under the GPL.
        !            11: 
        !            12:        The author may be reached as [email protected], or C/O
        !            13:        Scyld Computing Corporation
        !            14:        410 Severn Ave., Suite 210
        !            15:        Annapolis MD 21403
        !            16: 
        !            17:        Support information and updates available at
        !            18:        http://www.scyld.com/network/myson803.html
        !            19: */
        !            20: 
        !            21: /* These identify the driver base version and may not be removed. */
        !            22: static const char version1[] =
        !            23: "myson803.c:v1.05 3/10/2003 Written by Donald Becker <[email protected]>\n";
        !            24: static const char version2[] =
        !            25: "  http://www.scyld.com/network/drivers.html\n";
        !            26: 
        !            27: /* Automatically extracted configuration info:
        !            28: probe-func: myson803_probe
        !            29: config-in: tristate 'Myson MTD803 series Ethernet support' CONFIG_MYSON_ETHER
        !            30: 
        !            31: c-help-name: Myson MTD803 PCI Ethernet support
        !            32: c-help-symbol: CONFIG_MYSON_ETHER
        !            33: c-help: This driver is for the Myson MTD803 Ethernet adapter series.
        !            34: c-help: More specific information and updates are available from 
        !            35: c-help: http://www.scyld.com/network/drivers.html
        !            36: */
        !            37: 
        !            38: /* The user-configurable values.
        !            39:    These may be modified when a driver module is loaded.*/
        !            40: 
        !            41: /* Message enable level: 0..31 = no..all messages.  See NETIF_MSG docs. */
        !            42: static int debug = 2;
        !            43: 
        !            44: /* Maximum events (Rx packets, etc.) to handle at each interrupt. */
        !            45: static int max_interrupt_work = 40;
        !            46: 
        !            47: /* Maximum number of multicast addresses to filter (vs. rx-all-multicast).
        !            48:    This chip uses a 64 element hash table based on the Ethernet CRC.  */
        !            49: static int multicast_filter_limit = 32;
        !            50: 
        !            51: /* Set the copy breakpoint for the copy-only-tiny-frames scheme.
        !            52:    Setting to > 1518 effectively disables this feature. */
        !            53: static int rx_copybreak = 0;
        !            54: 
        !            55: /* Used to pass the media type, etc.
        !            56:    Both 'options[]' and 'full_duplex[]' should exist for driver
        !            57:    interoperability.
        !            58:    The media type is usually passed in 'options[]'.
        !            59:     The default is autonegotation for speed and duplex.
        !            60:        This should rarely be overridden.
        !            61:     Use option values 0x10/0x20 for 10Mbps, 0x100,0x200 for 100Mbps.
        !            62:     Use option values 0x10 and 0x100 for forcing half duplex fixed speed.
        !            63:     Use option values 0x20 and 0x200 for forcing full duplex operation.
        !            64: */
        !            65: #define MAX_UNITS 8            /* More are supported, limit only on options */
        !            66: static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
        !            67: static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
        !            68: 
        !            69: /* Operational parameters that are set at compile time. */
        !            70: 
        !            71: /* Keep the ring sizes a power of two for compile efficiency.
        !            72:    The compiler will convert <unsigned>'%'<2^N> into a bit mask.
        !            73:    Making the Tx ring too large decreases the effectiveness of channel
        !            74:    bonding and packet priority.
        !            75:    There are no ill effects from too-large receive rings. */
        !            76: #define TX_RING_SIZE   16
        !            77: #define TX_QUEUE_LEN   10              /* Limit Tx ring entries actually used.  */
        !            78: #define RX_RING_SIZE   32
        !            79: 
        !            80: /* Operational parameters that usually are not changed. */
        !            81: /* Time in jiffies before concluding the transmitter is hung. */
        !            82: #define TX_TIMEOUT  (6*HZ)
        !            83: 
        !            84: /* Allocation size of Rx buffers with normal sized Ethernet frames.
        !            85:    Do not change this value without good reason.  This is not a limit,
        !            86:    but a way to keep a consistent allocation size among drivers.
        !            87:  */
        !            88: #define PKT_BUF_SZ             1536
        !            89: 
        !            90: #ifndef __KERNEL__
        !            91: #define __KERNEL__
        !            92: #endif
        !            93: #if !defined(__OPTIMIZE__)
        !            94: #warning  You must compile this file with the correct options!
        !            95: #warning  See the last lines of the source file.
        !            96: #error You must compile this driver with "-O".
        !            97: #endif
        !            98: 
        !            99: /* Include files, designed to support most kernel versions 2.0.0 and later. */
        !           100: #include <linux/config.h>
        !           101: #if defined(CONFIG_SMP) && ! defined(__SMP__)
        !           102: #define __SMP__
        !           103: #endif
        !           104: #if defined(MODULE) && defined(CONFIG_MODVERSIONS) && ! defined(MODVERSIONS)
        !           105: #define MODVERSIONS
        !           106: #endif
        !           107: 
        !           108: #include <linux/version.h>
        !           109: #if defined(MODVERSIONS)
        !           110: #include <linux/modversions.h>
        !           111: #endif
        !           112: #include <linux/module.h>
        !           113: 
        !           114: #include <linux/kernel.h>
        !           115: #include <linux/string.h>
        !           116: #include <linux/timer.h>
        !           117: #include <linux/errno.h>
        !           118: #include <linux/ioport.h>
        !           119: #if LINUX_VERSION_CODE >= 0x20400
        !           120: #include <linux/slab.h>
        !           121: #else
        !           122: #include <linux/malloc.h>
        !           123: #endif
        !           124: #include <linux/interrupt.h>
        !           125: #include <linux/pci.h>
        !           126: #include <linux/netdevice.h>
        !           127: #include <linux/etherdevice.h>
        !           128: #include <linux/skbuff.h>
        !           129: #include <linux/delay.h>
        !           130: #include <asm/processor.h>             /* Processor type for cache alignment. */
        !           131: #include <asm/bitops.h>
        !           132: #include <asm/io.h>
        !           133: #include <asm/unaligned.h>
        !           134: 
        !           135: #ifdef INLINE_PCISCAN
        !           136: #include "k_compat.h"
        !           137: #else
        !           138: #include "pci-scan.h"
        !           139: #include "kern_compat.h"
        !           140: #endif
        !           141: 
        !           142: /* Condensed operations for readability. */
        !           143: #define virt_to_le32desc(addr)  cpu_to_le32(virt_to_bus(addr))
        !           144: #define le32desc_to_virt(addr)  bus_to_virt(le32_to_cpu(addr))
        !           145: 
        !           146: #if (LINUX_VERSION_CODE >= 0x20100)  &&  defined(MODULE)
        !           147: char kernel_version[] = UTS_RELEASE;
        !           148: #endif
        !           149: 
        !           150: /* Kernels before 2.1.0 cannot map the high addrs assigned by some BIOSes. */
        !           151: #if (LINUX_VERSION_CODE < 0x20100)  ||  ! defined(MODULE)
        !           152: #define USE_IO_OPS
        !           153: #endif
        !           154: 
        !           155: MODULE_AUTHOR("Donald Becker <[email protected]>");
        !           156: MODULE_DESCRIPTION("Myson mtd803 Ethernet driver");
        !           157: MODULE_LICENSE("GPL");
        !           158: /* List in order of common use. */
        !           159: MODULE_PARM(debug, "i");
        !           160: MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
        !           161: MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i");
        !           162: MODULE_PARM(max_interrupt_work, "i");
        !           163: MODULE_PARM(rx_copybreak, "i");
        !           164: MODULE_PARM(multicast_filter_limit, "i");
        !           165: MODULE_PARM_DESC(debug, "Driver message level (0-31)");
        !           166: MODULE_PARM_DESC(options, "Force transceiver type or fixed speed+duplex");
        !           167: MODULE_PARM_DESC(full_duplex, "Non-zero to force full duplex, "
        !           168:                                 "non-negotiated link (deprecated).");
        !           169: MODULE_PARM_DESC(max_interrupt_work,
        !           170:                                 "Maximum events handled per interrupt");
        !           171: MODULE_PARM_DESC(rx_copybreak,
        !           172:                                 "Breakpoint in bytes for copy-only-tiny-frames");
        !           173: MODULE_PARM_DESC(multicast_filter_limit,
        !           174:                                 "Multicast addresses before switching to Rx-all-multicast");
        !           175: 
        !           176: /*
        !           177:                                Theory of Operation
        !           178: 
        !           179: I. Board Compatibility
        !           180: 
        !           181: This driver is for the Myson mtd803 chip.
        !           182: It should work with other Myson 800 series chips.
        !           183: 
        !           184: II. Board-specific settings
        !           185: 
        !           186: None.
        !           187: 
        !           188: III. Driver operation
        !           189: 
        !           190: IIIa. Ring buffers
        !           191: 
        !           192: This driver uses two statically allocated fixed-size descriptor lists
        !           193: formed into rings by a branch from the final descriptor to the beginning of
        !           194: the list.  The ring sizes are set at compile time by RX/TX_RING_SIZE.
        !           195: Some chips explicitly use only 2^N sized rings, while others use a
        !           196: 'next descriptor' pointer that the driver forms into rings.
        !           197: 
        !           198: IIIb/c. Transmit/Receive Structure
        !           199: 
        !           200: This driver uses a zero-copy receive and transmit scheme.
        !           201: The driver allocates full frame size skbuffs for the Rx ring buffers at
        !           202: open() time and passes the skb->data field to the chip as receive data
        !           203: buffers.  When an incoming frame is less than RX_COPYBREAK bytes long,
        !           204: a fresh skbuff is allocated and the frame is copied to the new skbuff.
        !           205: When the incoming frame is larger, the skbuff is passed directly up the
        !           206: protocol stack.  Buffers consumed this way are replaced by newly allocated
        !           207: skbuffs in a later phase of receives.
        !           208: 
        !           209: The RX_COPYBREAK value is chosen to trade-off the memory wasted by
        !           210: using a full-sized skbuff for small frames vs. the copying costs of larger
        !           211: frames.  New boards are typically used in generously configured machines
        !           212: and the underfilled buffers have negligible impact compared to the benefit of
        !           213: a single allocation size, so the default value of zero results in never
        !           214: copying packets.  When copying is done, the cost is usually mitigated by using
        !           215: a combined copy/checksum routine.  Copying also preloads the cache, which is
        !           216: most useful with small frames.
        !           217: 
        !           218: A subtle aspect of the operation is that the IP header at offset 14 in an
        !           219: ethernet frame isn't longword aligned for further processing.
        !           220: When unaligned buffers are permitted by the hardware (and always on copies)
        !           221: frames are put into the skbuff at an offset of "+2", 16-byte aligning
        !           222: the IP header.
        !           223: 
        !           224: IIId. Synchronization
        !           225: 
        !           226: The driver runs as two independent, single-threaded flows of control.  One
        !           227: is the send-packet routine, which enforces single-threaded use by the
        !           228: dev->tbusy flag.  The other thread is the interrupt handler, which is single
        !           229: threaded by the hardware and interrupt handling software.
        !           230: 
        !           231: The send packet thread has partial control over the Tx ring and 'dev->tbusy'
        !           232: flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
        !           233: queue slot is empty, it clears the tbusy flag when finished otherwise it sets
        !           234: the 'lp->tx_full' flag.
        !           235: 
        !           236: The interrupt handler has exclusive control over the Rx ring and records stats
        !           237: from the Tx ring.  After reaping the stats, it marks the Tx queue entry as
        !           238: empty by incrementing the dirty_tx mark. Iff the 'lp->tx_full' flag is set, it
        !           239: clears both the tx_full and tbusy flags.
        !           240: 
        !           241: IIId. SMP semantics
        !           242: 
        !           243: The following are serialized with respect to each other via the "xmit_lock".
        !           244:   dev->hard_start_xmit()       Transmit a packet
        !           245:   dev->tx_timeout()                    Transmit watchdog for stuck Tx
        !           246:   dev->set_multicast_list()    Set the recieve filter.
        !           247: Note: The Tx timeout watchdog code is implemented by the timer routine in
        !           248: kernels up to 2.2.*.  In 2.4.* and later the timeout code is part of the
        !           249: driver interface.
        !           250: 
        !           251: The following fall under the global kernel lock.  The module will not be
        !           252: unloaded during the call, unless a call with a potential reschedule e.g.
        !           253: kmalloc() is called.  No other synchronization assertion is made.
        !           254:   dev->open()
        !           255:   dev->do_ioctl()
        !           256:   dev->get_stats()
        !           257: Caution: The lock for dev->open() is commonly broken with request_irq() or
        !           258: kmalloc().  It is best to avoid any lock-breaking call in do_ioctl() and
        !           259: get_stats(), or additional module locking code must be implemented.
        !           260: 
        !           261: The following is self-serialized (no simultaneous entry)
        !           262:   An handler registered with request_irq().
        !           263: 
        !           264: IV. Notes
        !           265: 
        !           266: IVb. References
        !           267: 
        !           268: http://www.scyld.com/expert/100mbps.html
        !           269: http://scyld.com/expert/NWay.html
        !           270: http://www.myson.com.hk/mtd/datasheet/mtd803.pdf
        !           271:    Myson does not require a NDA to read the datasheet.
        !           272: 
        !           273: IVc. Errata
        !           274: 
        !           275: No undocumented errata.
        !           276: */
        !           277: 
        !           278: 
        !           279: 
        !           280: /* PCI probe routines. */
        !           281: 
        !           282: static void *myson_probe1(struct pci_dev *pdev, void *init_dev,
        !           283:                                                   long ioaddr, int irq, int chip_idx, int find_cnt);
        !           284: static int netdev_pwr_event(void *dev_instance, int event);
        !           285: 
        !           286: /* Chips prior to the 803 have an external MII transceiver. */
        !           287: enum chip_capability_flags { HasMIIXcvr=1, HasChipXcvr=2 };
        !           288: 
        !           289: #ifdef USE_IO_OPS
        !           290: #define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_IO  | PCI_ADDR0)
        !           291: #define PCI_IOSIZE     256
        !           292: #else
        !           293: #define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_MEM | PCI_ADDR1)
        !           294: #define PCI_IOSIZE     1024
        !           295: #endif
        !           296: 
        !           297: static struct pci_id_info pci_id_tbl[] = {
        !           298:        {"Myson mtd803 Fast Ethernet", {0x08031516, 0xffffffff, },
        !           299:         PCI_IOTYPE, PCI_IOSIZE, HasChipXcvr},
        !           300:        {"Myson mtd891 Gigabit Ethernet", {0x08911516, 0xffffffff, },
        !           301:         PCI_IOTYPE, PCI_IOSIZE, HasChipXcvr},
        !           302:        {0,},                                           /* 0 terminated list. */
        !           303: };
        !           304: 
        !           305: struct drv_id_info myson803_drv_id = {
        !           306:        "myson803", 0, PCI_CLASS_NETWORK_ETHERNET<<8, pci_id_tbl, myson_probe1,
        !           307:        netdev_pwr_event };
        !           308: 
        !           309: /* This driver was written to use PCI memory space, however x86-oriented
        !           310:    hardware sometimes works only with I/O space accesses. */
        !           311: #ifdef USE_IO_OPS
        !           312: #undef readb
        !           313: #undef readw
        !           314: #undef readl
        !           315: #undef writeb
        !           316: #undef writew
        !           317: #undef writel
        !           318: #define readb inb
        !           319: #define readw inw
        !           320: #define readl inl
        !           321: #define writeb outb
        !           322: #define writew outw
        !           323: #define writel outl
        !           324: #endif
        !           325: 
        !           326: /* Offsets to the various registers.
        !           327:    Most accesses must be longword aligned. */
        !           328: enum register_offsets {
        !           329:        StationAddr=0x00, MulticastFilter0=0x08, MulticastFilter1=0x0C,
        !           330:        FlowCtrlAddr=0x10, RxConfig=0x18, TxConfig=0x1a, PCIBusCfg=0x1c,
        !           331:        TxStartDemand=0x20, RxStartDemand=0x24,
        !           332:        RxCurrentPtr=0x28, TxRingPtr=0x2c, RxRingPtr=0x30,
        !           333:        IntrStatus=0x34, IntrEnable=0x38,
        !           334:        FlowCtrlThreshold=0x3c,
        !           335:        MIICtrl=0x40, EECtrl=0x40, RxErrCnts=0x44, TxErrCnts=0x48,
        !           336:        PHYMgmt=0x4c,
        !           337: };
        !           338: 
        !           339: /* Bits in the interrupt status/mask registers. */
        !           340: enum intr_status_bits {
        !           341:        IntrRxErr=0x0002, IntrRxDone=0x0004, IntrTxDone=0x0008,
        !           342:        IntrTxEmpty=0x0010, IntrRxEmpty=0x0020, StatsMax=0x0040, RxEarly=0x0080,
        !           343:        TxEarly=0x0100, RxOverflow=0x0200, TxUnderrun=0x0400,
        !           344:        IntrPCIErr=0x2000, NWayDone=0x4000, LinkChange=0x8000,
        !           345: };
        !           346: 
        !           347: /* Bits in the RxMode (np->txrx_config) register. */
        !           348: enum rx_mode_bits {
        !           349:        RxEnable=0x01, RxFilter=0xfe,
        !           350:        AcceptErr=0x02, AcceptRunt=0x08, AcceptBroadcast=0x40,
        !           351:        AcceptMulticast=0x20, AcceptAllPhys=0x80, AcceptMyPhys=0x00,
        !           352:        RxFlowCtrl=0x2000,
        !           353:        TxEnable=0x40000, TxModeFDX=0x00100000, TxThreshold=0x00e00000,
        !           354: };
        !           355: 
        !           356: /* Misc. bits. */
        !           357: enum misc_bits {
        !           358:        BCR_Reset=1,                            /* PCIBusCfg */
        !           359:        TxThresholdInc=0x200000,
        !           360: };
        !           361: 
        !           362: /* The Rx and Tx buffer descriptors. */
        !           363: /* Note that using only 32 bit fields simplifies conversion to big-endian
        !           364:    architectures. */
        !           365: struct netdev_desc {
        !           366:        u32 status;
        !           367:        u32 ctrl_length;
        !           368:        u32 buf_addr;
        !           369:        u32 next_desc;
        !           370: };
        !           371: 
        !           372: /* Bits in network_desc.status */
        !           373: enum desc_status_bits {
        !           374:        DescOwn=0x80000000,
        !           375:        RxDescStartPacket=0x0800, RxDescEndPacket=0x0400, RxDescWholePkt=0x0c00,
        !           376:        RxDescErrSum=0x80, RxErrRunt=0x40, RxErrLong=0x20, RxErrFrame=0x10,
        !           377:        RxErrCRC=0x08, RxErrCode=0x04,
        !           378:        TxErrAbort=0x2000, TxErrCarrier=0x1000, TxErrLate=0x0800,
        !           379:        TxErr16Colls=0x0400, TxErrDefer=0x0200, TxErrHeartbeat=0x0100,
        !           380:        TxColls=0x00ff,
        !           381: };
        !           382: /* Bits in network_desc.ctrl_length */
        !           383: enum ctrl_length_bits {
        !           384:        TxIntrOnDone=0x80000000, TxIntrOnFIFO=0x40000000,
        !           385:        TxDescEndPacket=0x20000000, TxDescStartPacket=0x10000000,
        !           386:        TxAppendCRC=0x08000000, TxPadTo64=0x04000000, TxNormalPkt=0x3C000000,
        !           387: };
        !           388: 
        !           389: #define PRIV_ALIGN     15      /* Required alignment mask */
        !           390: /* Use  __attribute__((aligned (L1_CACHE_BYTES)))  to maintain alignment
        !           391:    within the structure. */
        !           392: struct netdev_private {
        !           393:        /* Descriptor rings first for alignment. */
        !           394:        struct netdev_desc rx_ring[RX_RING_SIZE];
        !           395:        struct netdev_desc tx_ring[TX_RING_SIZE];
        !           396:        struct net_device *next_module;         /* Link for devices of this type. */
        !           397:        void *priv_addr;                                        /* Unaligned address for kfree */
        !           398:        /* The addresses of receive-in-place skbuffs. */
        !           399:        struct sk_buff* rx_skbuff[RX_RING_SIZE];
        !           400:        /* The saved address of a sent-in-place packet/buffer, for later free(). */
        !           401:        struct sk_buff* tx_skbuff[TX_RING_SIZE];
        !           402:        struct net_device_stats stats;
        !           403:        struct timer_list timer;        /* Media monitoring timer. */
        !           404:        /* Frequently used values: keep some adjacent for cache effect. */
        !           405:        int msg_level;
        !           406:        int max_interrupt_work;
        !           407:        int intr_enable;
        !           408:        int chip_id, drv_flags;
        !           409:        struct pci_dev *pci_dev;
        !           410: 
        !           411:        struct netdev_desc *rx_head_desc;
        !           412:        unsigned int cur_rx, dirty_rx;          /* Producer/consumer ring indices */
        !           413:        unsigned int rx_buf_sz;                         /* Based on MTU+slack. */
        !           414:        int rx_copybreak;
        !           415: 
        !           416:        unsigned int cur_tx, dirty_tx;
        !           417:        unsigned int tx_full:1;                         /* The Tx queue is full. */
        !           418:        unsigned int rx_died:1;
        !           419:        unsigned int txrx_config;
        !           420: 
        !           421:        /* These values keep track of the transceiver/media in use. */
        !           422:        unsigned int full_duplex:1;                     /* Full-duplex operation requested. */
        !           423:        unsigned int duplex_lock:1;
        !           424:        unsigned int medialock:1;                       /* Do not sense media. */
        !           425:        unsigned int default_port;                      /* Last dev->if_port value. */
        !           426: 
        !           427:        unsigned int mcast_filter[2];
        !           428:        int multicast_filter_limit;
        !           429: 
        !           430:        /* MII transceiver section. */
        !           431:        int mii_cnt;                                            /* MII device addresses. */
        !           432:        u16 advertising;                                        /* NWay media advertisement */
        !           433:        unsigned char phys[2];                          /* MII device addresses. */
        !           434: };
        !           435: 
        !           436: static int  eeprom_read(long ioaddr, int location);
        !           437: static int  mdio_read(struct net_device *dev, int phy_id,
        !           438:                                          unsigned int location);
        !           439: static void mdio_write(struct net_device *dev, int phy_id,
        !           440:                                           unsigned int location, int value);
        !           441: static int  netdev_open(struct net_device *dev);
        !           442: static void check_duplex(struct net_device *dev);
        !           443: static void netdev_timer(unsigned long data);
        !           444: static void tx_timeout(struct net_device *dev);
        !           445: static void init_ring(struct net_device *dev);
        !           446: static int  start_tx(struct sk_buff *skb, struct net_device *dev);
        !           447: static void intr_handler(int irq, void *dev_instance, struct pt_regs *regs);
        !           448: static void netdev_error(struct net_device *dev, int intr_status);
        !           449: static int  netdev_rx(struct net_device *dev);
        !           450: static void netdev_error(struct net_device *dev, int intr_status);
        !           451: static void set_rx_mode(struct net_device *dev);
        !           452: static struct net_device_stats *get_stats(struct net_device *dev);
        !           453: static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
        !           454: static int  netdev_close(struct net_device *dev);
        !           455: 
        !           456: 
        !           457: 
        !           458: /* A list of our installed devices, for removing the driver module. */
        !           459: static struct net_device *root_net_dev = NULL;
        !           460: 
        !           461: #ifndef MODULE
        !           462: int myson803_probe(struct net_device *dev)
        !           463: {
        !           464:        if (pci_drv_register(&myson803_drv_id, dev) < 0)
        !           465:                return -ENODEV;
        !           466:        if (debug >= NETIF_MSG_DRV)     /* Emit version even if no cards detected. */
        !           467:                printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
        !           468:        return 0;
        !           469: }
        !           470: #endif
        !           471: 
        !           472: static void *myson_probe1(struct pci_dev *pdev, void *init_dev,
        !           473:                                                   long ioaddr, int irq, int chip_idx, int card_idx)
        !           474: {
        !           475:        struct net_device *dev;
        !           476:        struct netdev_private *np;
        !           477:        void *priv_mem;
        !           478:        int i, option = card_idx < MAX_UNITS ? options[card_idx] : 0;
        !           479: 
        !           480:        dev = init_etherdev(init_dev, 0);
        !           481:        if (!dev)
        !           482:                return NULL;
        !           483: 
        !           484:        printk(KERN_INFO "%s: %s at 0x%lx, ",
        !           485:                   dev->name, pci_id_tbl[chip_idx].name, ioaddr);
        !           486: 
        !           487:        for (i = 0; i < 3; i++)
        !           488:                ((u16 *)dev->dev_addr)[i] = le16_to_cpu(eeprom_read(ioaddr, i + 8));
        !           489:        if (memcmp(dev->dev_addr, "\0\0\0\0\0", 6) == 0) {
        !           490:                /* Fill a temp addr with the "locally administered" bit set. */
        !           491:                memcpy(dev->dev_addr, ">Linux", 6);
        !           492:        }
        !           493:        for (i = 0; i < 5; i++)
        !           494:                printk("%2.2x:", dev->dev_addr[i]);
        !           495:        printk("%2.2x, IRQ %d.\n", dev->dev_addr[i], irq);
        !           496: 
        !           497: #if ! defined(final_version) /* Dump the EEPROM contents during development. */
        !           498:        if (debug > 4)
        !           499:                for (i = 0; i < 0x40; i++)
        !           500:                        printk("%4.4x%s",
        !           501:                                   eeprom_read(ioaddr, i), i % 16 != 15 ? " " : "\n");
        !           502: #endif
        !           503: 
        !           504:        /* Make certain elements e.g. descriptor lists are aligned. */
        !           505:        priv_mem = kmalloc(sizeof(*np) + PRIV_ALIGN, GFP_KERNEL);
        !           506:        /* Check for the very unlikely case of no memory. */
        !           507:        if (priv_mem == NULL)
        !           508:                return NULL;
        !           509: 
        !           510:        /* Do bogusness checks before this point.
        !           511:           We do a request_region() only to register /proc/ioports info. */
        !           512: #ifdef USE_IO_OPS
        !           513:        request_region(ioaddr, pci_id_tbl[chip_idx].io_size, dev->name);
        !           514: #endif
        !           515: 
        !           516:        /* Reset the chip to erase previous misconfiguration. */
        !           517:        writel(BCR_Reset, ioaddr + PCIBusCfg);
        !           518: 
        !           519:        dev->base_addr = ioaddr;
        !           520:        dev->irq = irq;
        !           521: 
        !           522:        dev->priv = np = (void *)(((long)priv_mem + PRIV_ALIGN) & ~PRIV_ALIGN);
        !           523:        memset(np, 0, sizeof(*np));
        !           524:        np->priv_addr = priv_mem;
        !           525: 
        !           526:        np->next_module = root_net_dev;
        !           527:        root_net_dev = dev;
        !           528: 
        !           529:        np->pci_dev = pdev;
        !           530:        np->chip_id = chip_idx;
        !           531:        np->drv_flags = pci_id_tbl[chip_idx].drv_flags;
        !           532:        np->msg_level = (1 << debug) - 1;
        !           533:        np->rx_copybreak = rx_copybreak;
        !           534:        np->max_interrupt_work = max_interrupt_work;
        !           535:        np->multicast_filter_limit = multicast_filter_limit;
        !           536: 
        !           537:        if (dev->mem_start)
        !           538:                option = dev->mem_start;
        !           539: 
        !           540:        /* The lower four bits are the media type. */
        !           541:        if (option > 0) {
        !           542:                if (option & 0x220)
        !           543:                        np->full_duplex = 1;
        !           544:                np->default_port = option & 0x3ff;
        !           545:                if (np->default_port)
        !           546:                        np->medialock = 1;
        !           547:        }
        !           548:        if (card_idx < MAX_UNITS  &&  full_duplex[card_idx] > 0)
        !           549:                np->full_duplex = 1;
        !           550: 
        !           551:        if (np->full_duplex) {
        !           552:                if (np->msg_level & NETIF_MSG_PROBE)
        !           553:                        printk(KERN_INFO "%s: Set to forced full duplex, autonegotiation"
        !           554:                                   " disabled.\n", dev->name);
        !           555:                np->duplex_lock = 1;
        !           556:        }
        !           557: 
        !           558:        /* The chip-specific entries in the device structure. */
        !           559:        dev->open = &netdev_open;
        !           560:        dev->hard_start_xmit = &start_tx;
        !           561:        dev->stop = &netdev_close;
        !           562:        dev->get_stats = &get_stats;
        !           563:        dev->set_multicast_list = &set_rx_mode;
        !           564:        dev->do_ioctl = &mii_ioctl;
        !           565: 
        !           566:        if (np->drv_flags & HasMIIXcvr) {
        !           567:                int phy, phy_idx = 0;
        !           568:                for (phy = 0; phy < 32 && phy_idx < 4; phy++) {
        !           569:                        int mii_status = mdio_read(dev, phy, 1);
        !           570:                        if (mii_status != 0xffff  &&  mii_status != 0x0000) {
        !           571:                                np->phys[phy_idx++] = phy;
        !           572:                                np->advertising = mdio_read(dev, phy, 4);
        !           573:                                if (np->msg_level & NETIF_MSG_PROBE)
        !           574:                                        printk(KERN_INFO "%s: MII PHY found at address %d, status "
        !           575:                                                   "0x%4.4x advertising %4.4x.\n",
        !           576:                                                   dev->name, phy, mii_status, np->advertising);
        !           577:                        }
        !           578:                }
        !           579:                np->mii_cnt = phy_idx;
        !           580:        }
        !           581:        if (np->drv_flags & HasChipXcvr) {
        !           582:                np->phys[np->mii_cnt++] = 32;
        !           583:                printk(KERN_INFO "%s: Internal PHY status 0x%4.4x"
        !           584:                           " advertising %4.4x.\n",
        !           585:                           dev->name, mdio_read(dev, 32, 1), mdio_read(dev, 32, 4));
        !           586:        }
        !           587:        /* Allow forcing the media type. */
        !           588:        if (np->default_port & 0x330) {
        !           589:                np->medialock = 1;
        !           590:                if (option & 0x220)
        !           591:                        np->full_duplex = 1;
        !           592:                printk(KERN_INFO "  Forcing %dMbs %s-duplex operation.\n",
        !           593:                           (option & 0x300 ? 100 : 10),
        !           594:                           (np->full_duplex ? "full" : "half"));
        !           595:                if (np->mii_cnt)
        !           596:                        mdio_write(dev, np->phys[0], 0,
        !           597:                                           ((option & 0x300) ? 0x2000 : 0) |    /* 100mbps? */
        !           598:                                           (np->full_duplex ? 0x0100 : 0)); /* Full duplex? */
        !           599:        }
        !           600: 
        !           601:        return dev;
        !           602: }
        !           603: 
        !           604: 
        !           605: /* Read the EEPROM and MII Management Data I/O (MDIO) interfaces.  These are
        !           606:    often serial bit streams generated by the host processor.
        !           607:    The example below is for the common 93c46 EEPROM, 64 16 bit words. */
        !           608: 
        !           609: /* This "delay" forces out buffered PCI writes.
        !           610:    The udelay() is unreliable for timing, but some Myson NICs shipped with
        !           611:    absurdly slow EEPROMs.
        !           612:  */
        !           613: #define eeprom_delay(ee_addr)  readl(ee_addr); udelay(2); readl(ee_addr)
        !           614: 
        !           615: enum EEPROM_Ctrl_Bits {
        !           616:        EE_ShiftClk=0x04<<16, EE_ChipSelect=0x88<<16,
        !           617:        EE_DataOut=0x02<<16, EE_DataIn=0x01<<16,
        !           618:        EE_Write0=0x88<<16, EE_Write1=0x8a<<16,
        !           619: };
        !           620: 
        !           621: /* The EEPROM commands always start with 01.. preamble bits.
        !           622:    Commands are prepended to the variable-length address. */
        !           623: enum EEPROM_Cmds { EE_WriteCmd=5, EE_ReadCmd=6, EE_EraseCmd=7, };
        !           624: 
        !           625: static int eeprom_read(long addr, int location)
        !           626: {
        !           627:        int i;
        !           628:        int retval = 0;
        !           629:        long ee_addr = addr + EECtrl;
        !           630:        int read_cmd = location | (EE_ReadCmd<<6);
        !           631: 
        !           632:        writel(EE_ChipSelect, ee_addr);
        !           633: 
        !           634:        /* Shift the read command bits out. */
        !           635:        for (i = 10; i >= 0; i--) {
        !           636:                int dataval = (read_cmd & (1 << i)) ? EE_Write1 : EE_Write0;
        !           637:                writel(dataval, ee_addr);
        !           638:                eeprom_delay(ee_addr);
        !           639:                writel(dataval | EE_ShiftClk, ee_addr);
        !           640:                eeprom_delay(ee_addr);
        !           641:        }
        !           642:        writel(EE_ChipSelect, ee_addr);
        !           643:        eeprom_delay(ee_addr);
        !           644: 
        !           645:        for (i = 16; i > 0; i--) {
        !           646:                writel(EE_ChipSelect | EE_ShiftClk, ee_addr);
        !           647:                eeprom_delay(ee_addr);
        !           648:                retval = (retval << 1) | ((readl(ee_addr) & EE_DataIn) ? 1 : 0);
        !           649:                writel(EE_ChipSelect, ee_addr);
        !           650:                eeprom_delay(ee_addr);
        !           651:        }
        !           652: 
        !           653:        /* Terminate the EEPROM access. */
        !           654:        writel(EE_ChipSelect, ee_addr);
        !           655:        writel(0, ee_addr);
        !           656:        return retval;
        !           657: }
        !           658: 
        !           659: /*  MII transceiver control section.
        !           660:        Read and write the MII registers using software-generated serial
        !           661:        MDIO protocol.  See the MII specifications or DP83840A data sheet
        !           662:        for details.
        !           663: 
        !           664:        The maximum data clock rate is 2.5 Mhz.
        !           665:        The timing is decoupled from the processor clock by flushing the write
        !           666:        from the CPU write buffer with a following read, and using PCI
        !           667:        transaction timing. */
        !           668: #define mdio_in(mdio_addr) readl(mdio_addr)
        !           669: #define mdio_out(value, mdio_addr) writel(value, mdio_addr)
        !           670: #define mdio_delay(mdio_addr) readl(mdio_addr)
        !           671: 
        !           672: /* Set iff a MII transceiver on any interface requires mdio preamble.
        !           673:    This only set with older tranceivers, so the extra
        !           674:    code size of a per-interface flag is not worthwhile. */
        !           675: static char mii_preamble_required = 0;
        !           676: 
        !           677: enum mii_reg_bits {
        !           678:        MDIO_ShiftClk=0x0001, MDIO_Data=0x0002, MDIO_EnbOutput=0x0004,
        !           679: };
        !           680: #define MDIO_EnbIn  (0)
        !           681: #define MDIO_WRITE0 (MDIO_EnbOutput)
        !           682: #define MDIO_WRITE1 (MDIO_Data | MDIO_EnbOutput)
        !           683: 
        !           684: /* Generate the preamble required for initial synchronization and
        !           685:    a few older transceivers. */
        !           686: static void mdio_sync(long mdio_addr)
        !           687: {
        !           688:        int bits = 32;
        !           689: 
        !           690:        /* Establish sync by sending at least 32 logic ones. */
        !           691:        while (--bits >= 0) {
        !           692:                mdio_out(MDIO_WRITE1, mdio_addr);
        !           693:                mdio_delay(mdio_addr);
        !           694:                mdio_out(MDIO_WRITE1 | MDIO_ShiftClk, mdio_addr);
        !           695:                mdio_delay(mdio_addr);
        !           696:        }
        !           697: }
        !           698: 
        !           699: static int mdio_read(struct net_device *dev, int phy_id, unsigned int location)
        !           700: {
        !           701:        long ioaddr = dev->base_addr;
        !           702:        long mdio_addr = ioaddr + MIICtrl;
        !           703:        int mii_cmd = (0xf6 << 10) | (phy_id << 5) | location;
        !           704:        int i, retval = 0;
        !           705: 
        !           706:        if (location >= 32)
        !           707:                return 0xffff;
        !           708:        if (phy_id >= 32) {
        !           709:                if (location < 6)
        !           710:                        return readw(ioaddr + PHYMgmt + location*2);
        !           711:                else if (location == 16)
        !           712:                        return readw(ioaddr + PHYMgmt + 6*2);
        !           713:                else if (location == 17)
        !           714:                        return readw(ioaddr + PHYMgmt + 7*2);
        !           715:                else if (location == 18)
        !           716:                        return readw(ioaddr + PHYMgmt + 10*2);
        !           717:                else
        !           718:                        return 0;
        !           719:        }
        !           720: 
        !           721:        if (mii_preamble_required)
        !           722:                mdio_sync(mdio_addr);
        !           723: 
        !           724:        /* Shift the read command bits out. */
        !           725:        for (i = 15; i >= 0; i--) {
        !           726:                int dataval = (mii_cmd & (1 << i)) ? MDIO_WRITE1 : MDIO_WRITE0;
        !           727: 
        !           728:                mdio_out(dataval, mdio_addr);
        !           729:                mdio_delay(mdio_addr);
        !           730:                mdio_out(dataval | MDIO_ShiftClk, mdio_addr);
        !           731:                mdio_delay(mdio_addr);
        !           732:        }
        !           733:        /* Read the two transition, 16 data, and wire-idle bits. */
        !           734:        for (i = 19; i > 0; i--) {
        !           735:                mdio_out(MDIO_EnbIn, mdio_addr);
        !           736:                mdio_delay(mdio_addr);
        !           737:                retval = (retval << 1) | ((mdio_in(mdio_addr) & MDIO_Data) ? 1 : 0);
        !           738:                mdio_out(MDIO_EnbIn | MDIO_ShiftClk, mdio_addr);
        !           739:                mdio_delay(mdio_addr);
        !           740:        }
        !           741:        return (retval>>1) & 0xffff;
        !           742: }
        !           743: 
        !           744: static void mdio_write(struct net_device *dev, int phy_id,
        !           745:                                           unsigned int location, int value)
        !           746: {
        !           747:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           748:        long ioaddr = dev->base_addr;
        !           749:        long mdio_addr = ioaddr + MIICtrl;
        !           750:        int mii_cmd = (0x5002 << 16) | (phy_id << 23) | (location<<18) | value;
        !           751:        int i;
        !           752: 
        !           753:        if (location == 4  &&  phy_id == np->phys[0])
        !           754:                np->advertising = value;
        !           755:        else if (location >= 32)
        !           756:                return;
        !           757: 
        !           758:        if (phy_id == 32) {
        !           759:                if (location < 6)
        !           760:                        writew(value, ioaddr + PHYMgmt + location*2);
        !           761:                else if (location == 16)
        !           762:                        writew(value, ioaddr + PHYMgmt + 6*2);
        !           763:                else if (location == 17)
        !           764:                        writew(value, ioaddr + PHYMgmt + 7*2);
        !           765:                return;
        !           766:        }
        !           767: 
        !           768:        if (mii_preamble_required)
        !           769:                mdio_sync(mdio_addr);
        !           770: 
        !           771:        /* Shift the command bits out. */
        !           772:        for (i = 31; i >= 0; i--) {
        !           773:                int dataval = (mii_cmd & (1 << i)) ? MDIO_WRITE1 : MDIO_WRITE0;
        !           774: 
        !           775:                mdio_out(dataval, mdio_addr);
        !           776:                mdio_delay(mdio_addr);
        !           777:                mdio_out(dataval | MDIO_ShiftClk, mdio_addr);
        !           778:                mdio_delay(mdio_addr);
        !           779:        }
        !           780:        /* Clear out extra bits. */
        !           781:        for (i = 2; i > 0; i--) {
        !           782:                mdio_out(MDIO_EnbIn, mdio_addr);
        !           783:                mdio_delay(mdio_addr);
        !           784:                mdio_out(MDIO_EnbIn | MDIO_ShiftClk, mdio_addr);
        !           785:                mdio_delay(mdio_addr);
        !           786:        }
        !           787:        return;
        !           788: }
        !           789: 
        !           790: 
        !           791: static int netdev_open(struct net_device *dev)
        !           792: {
        !           793:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           794:        long ioaddr = dev->base_addr;
        !           795: 
        !           796:        /* Some chips may need to be reset. */
        !           797: 
        !           798:        MOD_INC_USE_COUNT;
        !           799: 
        !           800:        writel(~0, ioaddr + IntrStatus);
        !           801: 
        !           802:        /* Note that both request_irq() and init_ring() call kmalloc(), which
        !           803:           break the global kernel lock protecting this routine. */
        !           804:        if (request_irq(dev->irq, &intr_handler, SA_SHIRQ, dev->name, dev)) {
        !           805:                MOD_DEC_USE_COUNT;
        !           806:                return -EAGAIN;
        !           807:        }
        !           808: 
        !           809:        if (np->msg_level & NETIF_MSG_IFUP)
        !           810:                printk(KERN_DEBUG "%s: netdev_open() irq %d.\n",
        !           811:                           dev->name, dev->irq);
        !           812: 
        !           813:        init_ring(dev);
        !           814: 
        !           815:        writel(virt_to_bus(np->rx_ring), ioaddr + RxRingPtr);
        !           816:        writel(virt_to_bus(np->tx_ring), ioaddr + TxRingPtr);
        !           817: 
        !           818:        /* Address register must be written as words. */
        !           819:        writel(cpu_to_le32(cpu_to_le32(get_unaligned((u32 *)dev->dev_addr))),
        !           820:                                           ioaddr + StationAddr);
        !           821:        writel(cpu_to_le16(cpu_to_le16(get_unaligned((u16 *)(dev->dev_addr+4)))),
        !           822:                                           ioaddr + StationAddr + 4);
        !           823:        /* Set the flow control address, 01:80:c2:00:00:01. */
        !           824:        writel(0x00c28001, ioaddr + FlowCtrlAddr);
        !           825:        writel(0x00000100, ioaddr + FlowCtrlAddr + 4);
        !           826: 
        !           827:        /* Initialize other registers. */
        !           828:        /* Configure the PCI bus bursts and FIFO thresholds. */
        !           829:        writel(0x01f8, ioaddr + PCIBusCfg);
        !           830: 
        !           831:        if (dev->if_port == 0)
        !           832:                dev->if_port = np->default_port;
        !           833: 
        !           834:        np->txrx_config = TxEnable | RxEnable | RxFlowCtrl | 0x00600000;
        !           835:        np->mcast_filter[0] = np->mcast_filter[1] = 0;
        !           836:        np->rx_died = 0;
        !           837:        set_rx_mode(dev);
        !           838:        netif_start_tx_queue(dev);
        !           839: 
        !           840:        /* Enable interrupts by setting the interrupt mask. */
        !           841:        np->intr_enable = IntrRxDone | IntrRxErr | IntrRxEmpty | IntrTxDone
        !           842:                | IntrTxEmpty | StatsMax | RxOverflow | TxUnderrun | IntrPCIErr
        !           843:                | NWayDone | LinkChange;
        !           844:        writel(np->intr_enable, ioaddr + IntrEnable);
        !           845: 
        !           846:        if (np->msg_level & NETIF_MSG_IFUP)
        !           847:                printk(KERN_DEBUG "%s: Done netdev_open(), PHY status: %x %x.\n",
        !           848:                           dev->name, (int)readw(ioaddr + PHYMgmt),
        !           849:                           (int)readw(ioaddr + PHYMgmt + 2));
        !           850: 
        !           851:        /* Set the timer to check for link beat. */
        !           852:        init_timer(&np->timer);
        !           853:        np->timer.expires = jiffies + 3*HZ;
        !           854:        np->timer.data = (unsigned long)dev;
        !           855:        np->timer.function = &netdev_timer;                             /* timer handler */
        !           856:        add_timer(&np->timer);
        !           857: 
        !           858:        return 0;
        !           859: }
        !           860: 
        !           861: static void check_duplex(struct net_device *dev)
        !           862: {
        !           863:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           864:        long ioaddr = dev->base_addr;
        !           865:        int new_tx_mode = np->txrx_config;
        !           866: 
        !           867:        if (np->medialock) {
        !           868:        } else {
        !           869:                int mii_reg5 = mdio_read(dev, np->phys[0], 5);
        !           870:                int negotiated = mii_reg5 & np->advertising;
        !           871:                int duplex = (negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040;
        !           872:                if (np->duplex_lock  ||  mii_reg5 == 0xffff)
        !           873:                        return;
        !           874:                if (duplex)
        !           875:                        new_tx_mode |= TxModeFDX;
        !           876:                if (np->full_duplex != duplex) {
        !           877:                        np->full_duplex = duplex;
        !           878:                        if (np->msg_level & NETIF_MSG_LINK)
        !           879:                                printk(KERN_INFO "%s: Setting %s-duplex based on MII #%d"
        !           880:                                           " negotiated capability %4.4x.\n", dev->name,
        !           881:                                           duplex ? "full" : "half", np->phys[0], negotiated);
        !           882:                }
        !           883:        }
        !           884:        if (np->txrx_config != new_tx_mode)
        !           885:                writel(new_tx_mode, ioaddr + RxConfig);
        !           886: }
        !           887: 
        !           888: static void netdev_timer(unsigned long data)
        !           889: {
        !           890:        struct net_device *dev = (struct net_device *)data;
        !           891:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           892:        long ioaddr = dev->base_addr;
        !           893:        int next_tick = 10*HZ;
        !           894: 
        !           895:        if (np->msg_level & NETIF_MSG_TIMER) {
        !           896:                printk(KERN_DEBUG "%s: Media selection timer tick, status %8.8x.\n",
        !           897:                           dev->name, (int)readw(ioaddr + PHYMgmt + 10));
        !           898:        }
        !           899:        /* This will either have a small false-trigger window or will not catch
        !           900:           tbusy incorrectly set when the queue is empty. */
        !           901:        if (netif_queue_paused(dev)  &&
        !           902:                np->cur_tx - np->dirty_tx > 1  &&
        !           903:                (jiffies - dev->trans_start) > TX_TIMEOUT) {
        !           904:                tx_timeout(dev);
        !           905:        }
        !           906:        /* It's dead Jim, no race condition. */
        !           907:        if (np->rx_died)
        !           908:                netdev_rx(dev);
        !           909:        check_duplex(dev);
        !           910:        np->timer.expires = jiffies + next_tick;
        !           911:        add_timer(&np->timer);
        !           912: }
        !           913: 
        !           914: static void tx_timeout(struct net_device *dev)
        !           915: {
        !           916:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           917:        long ioaddr = dev->base_addr;
        !           918: 
        !           919:        printk(KERN_WARNING "%s: Transmit timed out, status %8.8x,"
        !           920:                   " resetting...\n", dev->name, (int)readl(ioaddr + IntrStatus));
        !           921: 
        !           922:        if (np->msg_level & NETIF_MSG_TX_ERR) {
        !           923:                int i;
        !           924:                printk(KERN_DEBUG "  Rx ring %p: ", np->rx_ring);
        !           925:                for (i = 0; i < RX_RING_SIZE; i++)
        !           926:                        printk(" %8.8x", (unsigned int)np->rx_ring[i].status);
        !           927:                printk("\n"KERN_DEBUG"  Tx ring %p: ", np->tx_ring);
        !           928:                for (i = 0; i < TX_RING_SIZE; i++)
        !           929:                        printk(" %8.8x", np->tx_ring[i].status);
        !           930:                printk("\n");
        !           931:        }
        !           932: 
        !           933:        /* Stop and restart the chip's Tx processes . */
        !           934:        writel(np->txrx_config & ~TxEnable, ioaddr + RxConfig);
        !           935:        writel(virt_to_bus(np->tx_ring + (np->dirty_tx%TX_RING_SIZE)),
        !           936:                   ioaddr + TxRingPtr);
        !           937:        writel(np->txrx_config, ioaddr + RxConfig);
        !           938:        /* Trigger an immediate transmit demand. */
        !           939:        writel(0, dev->base_addr + TxStartDemand);
        !           940: 
        !           941:        dev->trans_start = jiffies;
        !           942:        np->stats.tx_errors++;
        !           943:        return;
        !           944: }
        !           945: 
        !           946: 
        !           947: /* Initialize the Rx and Tx rings, along with various 'dev' bits. */
        !           948: static void init_ring(struct net_device *dev)
        !           949: {
        !           950:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           951:        int i;
        !           952: 
        !           953:        np->tx_full = 0;
        !           954:        np->cur_rx = np->cur_tx = 0;
        !           955:        np->dirty_rx = np->dirty_tx = 0;
        !           956: 
        !           957:        np->rx_buf_sz = (dev->mtu <= 1532 ? PKT_BUF_SZ : dev->mtu + 4);
        !           958:        np->rx_head_desc = &np->rx_ring[0];
        !           959: 
        !           960:        /* Initialize all Rx descriptors. */
        !           961:        for (i = 0; i < RX_RING_SIZE; i++) {
        !           962:                np->rx_ring[i].ctrl_length = cpu_to_le32(np->rx_buf_sz);
        !           963:                np->rx_ring[i].status = 0;
        !           964:                np->rx_ring[i].next_desc = virt_to_le32desc(&np->rx_ring[i+1]);
        !           965:                np->rx_skbuff[i] = 0;
        !           966:        }
        !           967:        /* Mark the last entry as wrapping the ring. */
        !           968:        np->rx_ring[i-1].next_desc = virt_to_le32desc(&np->rx_ring[0]);
        !           969: 
        !           970:        /* Fill in the Rx buffers.  Handle allocation failure gracefully. */
        !           971:        for (i = 0; i < RX_RING_SIZE; i++) {
        !           972:                struct sk_buff *skb = dev_alloc_skb(np->rx_buf_sz);
        !           973:                np->rx_skbuff[i] = skb;
        !           974:                if (skb == NULL)
        !           975:                        break;
        !           976:                skb->dev = dev;                 /* Mark as being used by this device. */
        !           977:                np->rx_ring[i].buf_addr = virt_to_le32desc(skb->tail);
        !           978:                np->rx_ring[i].status = cpu_to_le32(DescOwn);
        !           979:        }
        !           980:        np->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
        !           981: 
        !           982:        for (i = 0; i < TX_RING_SIZE; i++) {
        !           983:                np->tx_skbuff[i] = 0;
        !           984:                np->tx_ring[i].status = 0;
        !           985:                np->tx_ring[i].next_desc = virt_to_le32desc(&np->tx_ring[i+1]);
        !           986:        }
        !           987:        np->tx_ring[i-1].next_desc = virt_to_le32desc(&np->tx_ring[0]);
        !           988:        return;
        !           989: }
        !           990: 
        !           991: static int start_tx(struct sk_buff *skb, struct net_device *dev)
        !           992: {
        !           993:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           994:        unsigned entry;
        !           995: 
        !           996:        /* Block a timer-based transmit from overlapping.  This happens when
        !           997:           packets are presumed lost, and we use this check the Tx status. */
        !           998:        if (netif_pause_tx_queue(dev) != 0) {
        !           999:                /* This watchdog code is redundant with the media monitor timer. */
        !          1000:                if (jiffies - dev->trans_start > TX_TIMEOUT)
        !          1001:                        tx_timeout(dev);
        !          1002:                return 1;
        !          1003:        }
        !          1004: 
        !          1005:        /* Note: Ordering is important here, set the field with the
        !          1006:           "ownership" bit last, and only then increment cur_tx. */
        !          1007: 
        !          1008:        /* Calculate the next Tx descriptor entry. */
        !          1009:        entry = np->cur_tx % TX_RING_SIZE;
        !          1010: 
        !          1011:        np->tx_skbuff[entry] = skb;
        !          1012: 
        !          1013:        np->tx_ring[entry].buf_addr = virt_to_le32desc(skb->data);
        !          1014:        np->tx_ring[entry].ctrl_length =
        !          1015:                cpu_to_le32(TxIntrOnDone | TxNormalPkt | (skb->len << 11) | skb->len);
        !          1016:        np->tx_ring[entry].status = cpu_to_le32(DescOwn);
        !          1017:        np->cur_tx++;
        !          1018: 
        !          1019:        /* On some architectures: explicitly flushing cache lines here speeds
        !          1020:           operation. */
        !          1021: 
        !          1022:        if (np->cur_tx - np->dirty_tx >= TX_QUEUE_LEN - 1) {
        !          1023:                np->tx_full = 1;
        !          1024:                /* Check for a just-cleared queue. */
        !          1025:                if (np->cur_tx - (volatile unsigned int)np->dirty_tx
        !          1026:                        < TX_QUEUE_LEN - 2) {
        !          1027:                        np->tx_full = 0;
        !          1028:                        netif_unpause_tx_queue(dev);
        !          1029:                } else
        !          1030:                        netif_stop_tx_queue(dev);
        !          1031:        } else
        !          1032:                netif_unpause_tx_queue(dev);            /* Typical path */
        !          1033:        /* Wake the potentially-idle transmit channel. */
        !          1034:        writel(0, dev->base_addr + TxStartDemand);
        !          1035: 
        !          1036:        dev->trans_start = jiffies;
        !          1037: 
        !          1038:        if (np->msg_level & NETIF_MSG_TX_QUEUED) {
        !          1039:                printk(KERN_DEBUG "%s: Transmit frame #%d queued in slot %d.\n",
        !          1040:                           dev->name, np->cur_tx, entry);
        !          1041:        }
        !          1042:        return 0;
        !          1043: }
        !          1044: 
        !          1045: /* The interrupt handler does all of the Rx thread work and cleans up
        !          1046:    after the Tx thread. */
        !          1047: static void intr_handler(int irq, void *dev_instance, struct pt_regs *rgs)
        !          1048: {
        !          1049:        struct net_device *dev = (struct net_device *)dev_instance;
        !          1050:        struct netdev_private *np;
        !          1051:        long ioaddr;
        !          1052:        int boguscnt;
        !          1053: 
        !          1054: #ifndef final_version                  /* Can never occur. */
        !          1055:        if (dev == NULL) {
        !          1056:                printk (KERN_ERR "Netdev interrupt handler(): IRQ %d for unknown "
        !          1057:                                "device.\n", irq);
        !          1058:                return;
        !          1059:        }
        !          1060: #endif
        !          1061: 
        !          1062:        ioaddr = dev->base_addr;
        !          1063:        np = (struct netdev_private *)dev->priv;
        !          1064:        boguscnt = np->max_interrupt_work;
        !          1065: 
        !          1066: #if defined(__i386__)  &&  LINUX_VERSION_CODE < 0x020300
        !          1067:        /* A lock to prevent simultaneous entry bug on Intel SMP machines. */
        !          1068:        if (test_and_set_bit(0, (void*)&dev->interrupt)) {
        !          1069:                printk(KERN_ERR"%s: SMP simultaneous entry of an interrupt handler.\n",
        !          1070:                           dev->name);
        !          1071:                dev->interrupt = 0;     /* Avoid halting machine. */
        !          1072:                return;
        !          1073:        }
        !          1074: #endif
        !          1075: 
        !          1076:        do {
        !          1077:                u32 intr_status = readl(ioaddr + IntrStatus);
        !          1078: 
        !          1079:                /* Acknowledge all of the current interrupt sources ASAP. */
        !          1080:                writel(intr_status, ioaddr + IntrStatus);
        !          1081: 
        !          1082:                if (np->msg_level & NETIF_MSG_INTR)
        !          1083:                        printk(KERN_DEBUG "%s: Interrupt, status %4.4x.\n",
        !          1084:                                   dev->name, intr_status);
        !          1085: 
        !          1086:                if (intr_status == 0)
        !          1087:                        break;
        !          1088: 
        !          1089:                if (intr_status & IntrRxDone)
        !          1090:                        netdev_rx(dev);
        !          1091: 
        !          1092:                for (; np->cur_tx - np->dirty_tx > 0; np->dirty_tx++) {
        !          1093:                        int entry = np->dirty_tx % TX_RING_SIZE;
        !          1094:                        int tx_status = le32_to_cpu(np->tx_ring[entry].status);
        !          1095:                        if (tx_status & DescOwn)
        !          1096:                                break;
        !          1097:                        if (np->msg_level & NETIF_MSG_TX_DONE)
        !          1098:                                printk(KERN_DEBUG "%s: Transmit done, Tx status %8.8x.\n",
        !          1099:                                           dev->name, tx_status);
        !          1100:                        if (tx_status & (TxErrAbort | TxErrCarrier | TxErrLate
        !          1101:                                                         | TxErr16Colls | TxErrHeartbeat)) {
        !          1102:                                if (np->msg_level & NETIF_MSG_TX_ERR)
        !          1103:                                        printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n",
        !          1104:                                                   dev->name, tx_status);
        !          1105:                                np->stats.tx_errors++;
        !          1106:                                if (tx_status & TxErrCarrier) np->stats.tx_carrier_errors++;
        !          1107:                                if (tx_status & TxErrLate) np->stats.tx_window_errors++;
        !          1108:                                if (tx_status & TxErrHeartbeat) np->stats.tx_heartbeat_errors++;
        !          1109: #ifdef ETHER_STATS
        !          1110:                                if (tx_status & TxErr16Colls) np->stats.collisions16++;
        !          1111:                                if (tx_status & TxErrAbort) np->stats.tx_aborted_errors++;
        !          1112: #else
        !          1113:                                if (tx_status & (TxErr16Colls|TxErrAbort))
        !          1114:                                        np->stats.tx_aborted_errors++;
        !          1115: #endif
        !          1116:                        } else {
        !          1117:                                np->stats.tx_packets++;
        !          1118:                                np->stats.collisions += tx_status & TxColls;
        !          1119: #if LINUX_VERSION_CODE > 0x20127
        !          1120:                                np->stats.tx_bytes += np->tx_skbuff[entry]->len;
        !          1121: #endif
        !          1122: #ifdef ETHER_STATS
        !          1123:                                if (tx_status & TxErrDefer) np->stats.tx_deferred++;
        !          1124: #endif
        !          1125:                        }
        !          1126:                        /* Free the original skb. */
        !          1127:                        dev_free_skb_irq(np->tx_skbuff[entry]);
        !          1128:                        np->tx_skbuff[entry] = 0;
        !          1129:                }
        !          1130:                /* Note the 4 slot hysteresis to mark the queue non-full. */
        !          1131:                if (np->tx_full  &&  np->cur_tx - np->dirty_tx < TX_QUEUE_LEN - 4) {
        !          1132:                        /* The ring is no longer full, allow new TX entries. */
        !          1133:                        np->tx_full = 0;
        !          1134:                        netif_resume_tx_queue(dev);
        !          1135:                }
        !          1136: 
        !          1137:                /* Abnormal error summary/uncommon events handlers. */
        !          1138:                if (intr_status & (IntrRxErr | IntrRxEmpty | StatsMax | RxOverflow
        !          1139:                                                   | TxUnderrun | IntrPCIErr | NWayDone | LinkChange))
        !          1140:                        netdev_error(dev, intr_status);
        !          1141: 
        !          1142:                if (--boguscnt < 0) {
        !          1143:                        printk(KERN_WARNING "%s: Too much work at interrupt, "
        !          1144:                                   "status=0x%4.4x.\n",
        !          1145:                                   dev->name, intr_status);
        !          1146:                        break;
        !          1147:                }
        !          1148:        } while (1);
        !          1149: 
        !          1150:        if (np->msg_level & NETIF_MSG_INTR)
        !          1151:                printk(KERN_DEBUG "%s: exiting interrupt, status=%#4.4x.\n",
        !          1152:                           dev->name, (int)readl(ioaddr + IntrStatus));
        !          1153: 
        !          1154: #if defined(__i386__)  &&  LINUX_VERSION_CODE < 0x020300
        !          1155:        clear_bit(0, (void*)&dev->interrupt);
        !          1156: #endif
        !          1157:        return;
        !          1158: }
        !          1159: 
        !          1160: /* This routine is logically part of the interrupt handler, but separated
        !          1161:    for clarity and better register allocation. */
        !          1162: static int netdev_rx(struct net_device *dev)
        !          1163: {
        !          1164:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1165:        int entry = np->cur_rx % RX_RING_SIZE;
        !          1166:        int boguscnt = np->dirty_rx + RX_RING_SIZE - np->cur_rx;
        !          1167:        int refilled = 0;
        !          1168: 
        !          1169:        if (np->msg_level & NETIF_MSG_RX_STATUS) {
        !          1170:                printk(KERN_DEBUG " In netdev_rx(), entry %d status %4.4x.\n",
        !          1171:                           entry, np->rx_ring[entry].status);
        !          1172:        }
        !          1173: 
        !          1174:        /* If EOP is set on the next entry, it's a new packet. Send it up. */
        !          1175:        while ( ! (np->rx_head_desc->status & cpu_to_le32(DescOwn))) {
        !          1176:                struct netdev_desc *desc = np->rx_head_desc;
        !          1177:                u32 desc_status = le32_to_cpu(desc->status);
        !          1178: 
        !          1179:                if (np->msg_level & NETIF_MSG_RX_STATUS)
        !          1180:                        printk(KERN_DEBUG "  netdev_rx() status was %8.8x.\n",
        !          1181:                                   desc_status);
        !          1182:                if (--boguscnt < 0)
        !          1183:                        break;
        !          1184:                if ((desc_status & RxDescWholePkt) != RxDescWholePkt) {
        !          1185:                        printk(KERN_WARNING "%s: Oversized Ethernet frame spanned "
        !          1186:                                   "multiple buffers, entry %#x length %d status %4.4x!\n",
        !          1187:                                   dev->name, np->cur_rx, desc_status >> 16, desc_status);
        !          1188:                        np->stats.rx_length_errors++;
        !          1189:                } else if (desc_status & RxDescErrSum) {
        !          1190:                        /* There was a error. */
        !          1191:                        if (np->msg_level & NETIF_MSG_RX_ERR)
        !          1192:                                printk(KERN_DEBUG "  netdev_rx() Rx error was %8.8x.\n",
        !          1193:                                           desc_status);
        !          1194:                        np->stats.rx_errors++;
        !          1195:                        if (desc_status & (RxErrLong|RxErrRunt))
        !          1196:                                np->stats.rx_length_errors++;
        !          1197:                        if (desc_status & (RxErrFrame|RxErrCode))
        !          1198:                                np->stats.rx_frame_errors++;
        !          1199:                        if (desc_status & RxErrCRC)
        !          1200:                                np->stats.rx_crc_errors++;
        !          1201:                } else {
        !          1202:                        struct sk_buff *skb;
        !          1203:                        /* Reported length should omit the CRC. */
        !          1204:                        u16 pkt_len = ((desc_status >> 16) & 0xfff) - 4;
        !          1205: 
        !          1206: #ifndef final_version
        !          1207:                        if (np->msg_level & NETIF_MSG_RX_STATUS)
        !          1208:                                printk(KERN_DEBUG "  netdev_rx() normal Rx pkt length %d"
        !          1209:                                           " of %d, bogus_cnt %d.\n",
        !          1210:                                           pkt_len, pkt_len, boguscnt);
        !          1211: #endif
        !          1212:                        /* Check if the packet is long enough to accept without copying
        !          1213:                           to a minimally-sized skbuff. */
        !          1214:                        if (pkt_len < np->rx_copybreak
        !          1215:                                && (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
        !          1216:                                skb->dev = dev;
        !          1217:                                skb_reserve(skb, 2);    /* 16 byte align the IP header */
        !          1218:                                eth_copy_and_sum(skb, np->rx_skbuff[entry]->tail, pkt_len, 0);
        !          1219:                                skb_put(skb, pkt_len);
        !          1220:                        } else {
        !          1221:                                skb_put(skb = np->rx_skbuff[entry], pkt_len);
        !          1222:                                np->rx_skbuff[entry] = NULL;
        !          1223:                        }
        !          1224: #ifndef final_version                          /* Remove after testing. */
        !          1225:                        /* You will want this info for the initial debug. */
        !          1226:                        if (np->msg_level & NETIF_MSG_PKTDATA)
        !          1227:                                printk(KERN_DEBUG "  Rx data %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:"
        !          1228:                                           "%2.2x %2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x %2.2x%2.2x "
        !          1229:                                           "%d.%d.%d.%d.\n",
        !          1230:                                           skb->data[0], skb->data[1], skb->data[2], skb->data[3],
        !          1231:                                           skb->data[4], skb->data[5], skb->data[6], skb->data[7],
        !          1232:                                           skb->data[8], skb->data[9], skb->data[10],
        !          1233:                                           skb->data[11], skb->data[12], skb->data[13],
        !          1234:                                           skb->data[14], skb->data[15], skb->data[16],
        !          1235:                                           skb->data[17]);
        !          1236: #endif
        !          1237:                        skb->mac.raw = skb->data;
        !          1238:                        /* Protocol lookup disabled until verified with all kernels. */
        !          1239:                        if (0 && ntohs(skb->mac.ethernet->h_proto) >= 0x0800) {
        !          1240:                                struct ethhdr *eth = skb->mac.ethernet;
        !          1241:                                skb->protocol = eth->h_proto;
        !          1242:                                if (desc_status & 0x1000) {
        !          1243:                                        if ((dev->flags & IFF_PROMISC) &&
        !          1244:                                                memcmp(eth->h_dest, dev->dev_addr, ETH_ALEN))
        !          1245:                                                skb->pkt_type = PACKET_OTHERHOST;
        !          1246:                                } else if (desc_status & 0x2000)
        !          1247:                                        skb->pkt_type = PACKET_BROADCAST;
        !          1248:                                else if (desc_status & 0x4000)
        !          1249:                                        skb->pkt_type = PACKET_MULTICAST;
        !          1250:                        } else
        !          1251:                                skb->protocol = eth_type_trans(skb, dev);
        !          1252:                        netif_rx(skb);
        !          1253:                        dev->last_rx = jiffies;
        !          1254:                        np->stats.rx_packets++;
        !          1255: #if LINUX_VERSION_CODE > 0x20127
        !          1256:                        np->stats.rx_bytes += pkt_len;
        !          1257: #endif
        !          1258:                }
        !          1259:                entry = (++np->cur_rx) % RX_RING_SIZE;
        !          1260:                np->rx_head_desc = &np->rx_ring[entry];
        !          1261:        }
        !          1262: 
        !          1263:        /* Refill the Rx ring buffers. */
        !          1264:        for (; np->cur_rx - np->dirty_rx > 0; np->dirty_rx++) {
        !          1265:                struct sk_buff *skb;
        !          1266:                entry = np->dirty_rx % RX_RING_SIZE;
        !          1267:                if (np->rx_skbuff[entry] == NULL) {
        !          1268:                        skb = dev_alloc_skb(np->rx_buf_sz);
        !          1269:                        np->rx_skbuff[entry] = skb;
        !          1270:                        if (skb == NULL)
        !          1271:                                break;                          /* Better luck next round. */
        !          1272:                        skb->dev = dev;                 /* Mark as being used by this device. */
        !          1273:                        np->rx_ring[entry].buf_addr = virt_to_le32desc(skb->tail);
        !          1274:                }
        !          1275:                np->rx_ring[entry].ctrl_length = cpu_to_le32(np->rx_buf_sz);
        !          1276:                np->rx_ring[entry].status = cpu_to_le32(DescOwn);
        !          1277:                refilled++;
        !          1278:        }
        !          1279: 
        !          1280:        /* Restart Rx engine if stopped. */
        !          1281:        if (refilled) {                         /* Perhaps  "&& np->rx_died" */
        !          1282:                writel(0, dev->base_addr + RxStartDemand);
        !          1283:                np->rx_died = 0;
        !          1284:        }
        !          1285:        return refilled;
        !          1286: }
        !          1287: 
        !          1288: static void netdev_error(struct net_device *dev, int intr_status)
        !          1289: {
        !          1290:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1291:        long ioaddr = dev->base_addr;
        !          1292: 
        !          1293:        if (intr_status & (LinkChange | NWayDone)) {
        !          1294:                if (np->msg_level & NETIF_MSG_LINK)
        !          1295:                        printk(KERN_NOTICE "%s: Link changed: Autonegotiation advertising"
        !          1296:                                   " %4.4x  partner %4.4x.\n", dev->name,
        !          1297:                                   mdio_read(dev, np->phys[0], 4),
        !          1298:                                   mdio_read(dev, np->phys[0], 5));
        !          1299:                /* Clear sticky bit first. */
        !          1300:                readw(ioaddr + PHYMgmt + 2);
        !          1301:                if (readw(ioaddr + PHYMgmt + 2) & 0x0004)
        !          1302:                        netif_link_up(dev);
        !          1303:                else
        !          1304:                        netif_link_down(dev);
        !          1305:                check_duplex(dev);
        !          1306:        }
        !          1307:        if ((intr_status & TxUnderrun)
        !          1308:                && (np->txrx_config & TxThreshold) != TxThreshold) {
        !          1309:                np->txrx_config += TxThresholdInc;
        !          1310:                writel(np->txrx_config, ioaddr + RxConfig);
        !          1311:                np->stats.tx_fifo_errors++;
        !          1312:        }
        !          1313:        if (intr_status & IntrRxEmpty) {
        !          1314:                printk(KERN_WARNING "%s: Out of receive buffers: no free memory.\n",
        !          1315:                           dev->name);
        !          1316:                /* Refill Rx descriptors */
        !          1317:                np->rx_died = 1;
        !          1318:                netdev_rx(dev);
        !          1319:        }
        !          1320:        if (intr_status & RxOverflow) {
        !          1321:                printk(KERN_WARNING "%s: Receiver overflow.\n", dev->name);
        !          1322:                np->stats.rx_over_errors++;
        !          1323:                netdev_rx(dev);                 /* Refill Rx descriptors */
        !          1324:                get_stats(dev);                 /* Empty dropped counter. */
        !          1325:        }
        !          1326:        if (intr_status & StatsMax) {
        !          1327:                get_stats(dev);
        !          1328:        }
        !          1329:        if ((intr_status & ~(LinkChange|NWayDone|StatsMax|TxUnderrun|RxOverflow
        !          1330:                                                 |TxEarly|RxEarly|0x001e))
        !          1331:                && (np->msg_level & NETIF_MSG_DRV))
        !          1332:                printk(KERN_ERR "%s: Something Wicked happened! %4.4x.\n",
        !          1333:                           dev->name, intr_status);
        !          1334:        /* Hmmmmm, it's not clear how to recover from PCI faults. */
        !          1335:        if (intr_status & IntrPCIErr) {
        !          1336:                const char *const pcierr[4] =
        !          1337:                { "Parity Error", "Master Abort", "Target Abort", "Unknown Error" };
        !          1338:                if (np->msg_level & NETIF_MSG_DRV)
        !          1339:                        printk(KERN_WARNING "%s: PCI Bus %s, %x.\n",
        !          1340:                                   dev->name, pcierr[(intr_status>>11) & 3], intr_status);
        !          1341:        }
        !          1342: }
        !          1343: 
        !          1344: /* We do not bother to spinlock statistics.
        !          1345:    A window only exists if we have non-atomic adds, the error counts are
        !          1346:    typically zero, and statistics are non-critical. */ 
        !          1347: static struct net_device_stats *get_stats(struct net_device *dev)
        !          1348: {
        !          1349:        long ioaddr = dev->base_addr;
        !          1350:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1351:        unsigned int rxerrs = readl(ioaddr + RxErrCnts);
        !          1352:        unsigned int txerrs = readl(ioaddr + TxErrCnts);
        !          1353: 
        !          1354:        /* The chip only need report frames silently dropped. */
        !          1355:        np->stats.rx_crc_errors += rxerrs >> 16;
        !          1356:        np->stats.rx_missed_errors      += rxerrs & 0xffff;
        !          1357: 
        !          1358:        /* These stats are required when the descriptor is closed before Tx. */
        !          1359:        np->stats.tx_aborted_errors += txerrs >> 24;
        !          1360:        np->stats.tx_window_errors += (txerrs >> 16) & 0xff;
        !          1361:        np->stats.collisions += txerrs & 0xffff;
        !          1362: 
        !          1363:        return &np->stats;
        !          1364: }
        !          1365: 
        !          1366: /* Big-endian AUTODIN II ethernet CRC calculations.
        !          1367:    This is slow but compact code.  Do not use this routine for bulk data,
        !          1368:    use a table-based routine instead.
        !          1369:    This is common code and may be in the kernel with Linux 2.5+.
        !          1370: */
        !          1371: static unsigned const ethernet_polynomial = 0x04c11db7U;
        !          1372: static inline u32 ether_crc(int length, unsigned char *data)
        !          1373: {
        !          1374:        u32 crc = ~0;
        !          1375: 
        !          1376:        while(--length >= 0) {
        !          1377:                unsigned char current_octet = *data++;
        !          1378:                int bit;
        !          1379:                for (bit = 0; bit < 8; bit++, current_octet >>= 1)
        !          1380:                        crc = (crc << 1) ^
        !          1381:                                ((crc < 0) ^ (current_octet & 1) ? ethernet_polynomial : 0);
        !          1382:        }
        !          1383:        return crc;
        !          1384: }
        !          1385: 
        !          1386: static void set_rx_mode(struct net_device *dev)
        !          1387: {
        !          1388:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1389:        long ioaddr = dev->base_addr;
        !          1390:        u32 mc_filter[2];                       /* Multicast hash filter */
        !          1391:        u32 rx_mode;
        !          1392: 
        !          1393:        if (dev->flags & IFF_PROMISC) {                 /* Set promiscuous. */
        !          1394:                /* Unconditionally log net taps. */
        !          1395:                printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
        !          1396:                mc_filter[1] = mc_filter[0] = ~0;
        !          1397:                rx_mode = AcceptBroadcast | AcceptMulticast | AcceptAllPhys
        !          1398:                        | AcceptMyPhys;
        !          1399:        } else if ((dev->mc_count > np->multicast_filter_limit)
        !          1400:                           ||  (dev->flags & IFF_ALLMULTI)) {
        !          1401:                /* Too many to match, or accept all multicasts. */
        !          1402:                mc_filter[1] = mc_filter[0] = ~0;
        !          1403:                rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
        !          1404:        } else {
        !          1405:                struct dev_mc_list *mclist;
        !          1406:                int i;
        !          1407:                mc_filter[1] = mc_filter[0] = 0;
        !          1408:                for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
        !          1409:                         i++, mclist = mclist->next) {
        !          1410:                        set_bit((ether_crc(ETH_ALEN, mclist->dmi_addr) >> 26) & 0x3f,
        !          1411:                                        mc_filter);
        !          1412:                }
        !          1413:                rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
        !          1414:        }
        !          1415:        if (mc_filter[0] != np->mcast_filter[0]  ||
        !          1416:                mc_filter[1] != np->mcast_filter[1]) {
        !          1417:                writel(mc_filter[0], ioaddr + MulticastFilter0);
        !          1418:                writel(mc_filter[1], ioaddr + MulticastFilter1);
        !          1419:                np->mcast_filter[0] = mc_filter[0];
        !          1420:                np->mcast_filter[1] = mc_filter[1];
        !          1421:        }
        !          1422:        if ((np->txrx_config & RxFilter) != rx_mode) {
        !          1423:                np->txrx_config &= ~RxFilter;
        !          1424:                np->txrx_config |= rx_mode;
        !          1425:                writel(np->txrx_config, ioaddr + RxConfig);
        !          1426:        }
        !          1427: }
        !          1428: 
        !          1429: /*
        !          1430:   Handle user-level ioctl() calls.
        !          1431:   We must use two numeric constants as the key because some clueless person
        !          1432:   changed the value for the symbolic name.
        !          1433: */
        !          1434: static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
        !          1435: {
        !          1436:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1437:        u16 *data = (u16 *)&rq->ifr_data;
        !          1438:        u32 *data32 = (void *)&rq->ifr_data;
        !          1439: 
        !          1440:        switch(cmd) {
        !          1441:        case 0x8947: case 0x89F0:
        !          1442:                /* SIOCGMIIPHY: Get the address of the PHY in use. */
        !          1443:                data[0] = np->phys[0];
        !          1444:                /* Fall Through */
        !          1445:        case 0x8948: case 0x89F1:
        !          1446:                /* SIOCGMIIREG: Read the specified MII register. */
        !          1447:                data[3] = mdio_read(dev, data[0], data[1]);
        !          1448:                return 0;
        !          1449:        case 0x8949: case 0x89F2:
        !          1450:                /* SIOCSMIIREG: Write the specified MII register */
        !          1451:                if (!capable(CAP_NET_ADMIN))
        !          1452:                        return -EPERM;
        !          1453:                if (data[0] == np->phys[0]) {
        !          1454:                        u16 value = data[2];
        !          1455:                        switch (data[1]) {
        !          1456:                        case 0:
        !          1457:                                /* Check for autonegotiation on or reset. */
        !          1458:                                np->medialock = (value & 0x9000) ? 0 : 1;
        !          1459:                                if (np->medialock)
        !          1460:                                        np->full_duplex = (value & 0x0100) ? 1 : 0;
        !          1461:                                break;
        !          1462:                        case 4: np->advertising = value; break;
        !          1463:                        }
        !          1464:                        /* Perhaps check_duplex(dev), depending on chip semantics. */
        !          1465:                }
        !          1466:                mdio_write(dev, data[0], data[1], data[2]);
        !          1467:                return 0;
        !          1468:        case SIOCGPARAMS:
        !          1469:                data32[0] = np->msg_level;
        !          1470:                data32[1] = np->multicast_filter_limit;
        !          1471:                data32[2] = np->max_interrupt_work;
        !          1472:                data32[3] = np->rx_copybreak;
        !          1473:                return 0;
        !          1474:        case SIOCSPARAMS:
        !          1475:                if (!capable(CAP_NET_ADMIN))
        !          1476:                        return -EPERM;
        !          1477:                np->msg_level = data32[0];
        !          1478:                np->multicast_filter_limit = data32[1];
        !          1479:                np->max_interrupt_work = data32[2];
        !          1480:                np->rx_copybreak = data32[3];
        !          1481:                return 0;
        !          1482:        default:
        !          1483:                return -EOPNOTSUPP;
        !          1484:        }
        !          1485: }
        !          1486: 
        !          1487: static int netdev_close(struct net_device *dev)
        !          1488: {
        !          1489:        long ioaddr = dev->base_addr;
        !          1490:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1491:        int i;
        !          1492: 
        !          1493:        netif_stop_tx_queue(dev);
        !          1494: 
        !          1495:        if (np->msg_level & NETIF_MSG_IFDOWN) {
        !          1496:                printk(KERN_DEBUG "%s: Shutting down ethercard, status was %8.8x.\n",
        !          1497:                           dev->name, (int)readl(ioaddr + RxConfig));
        !          1498:                printk(KERN_DEBUG "%s: Queue pointers were Tx %d / %d,  Rx %d / %d.\n",
        !          1499:                           dev->name, np->cur_tx, np->dirty_tx, np->cur_rx, np->dirty_rx);
        !          1500:        }
        !          1501: 
        !          1502:        /* Disable interrupts by clearing the interrupt mask. */
        !          1503:        writel(0x0000, ioaddr + IntrEnable);
        !          1504: 
        !          1505:        /* Stop the chip's Tx and Rx processes. */
        !          1506:        np->txrx_config = 0;
        !          1507:        writel(0, ioaddr + RxConfig);
        !          1508: 
        !          1509:        del_timer(&np->timer);
        !          1510: 
        !          1511: #ifdef __i386__
        !          1512:        if (np->msg_level & NETIF_MSG_IFDOWN) {
        !          1513:                printk("\n"KERN_DEBUG"  Tx ring at %8.8x:\n",
        !          1514:                           (int)virt_to_bus(np->tx_ring));
        !          1515:                for (i = 0; i < TX_RING_SIZE; i++)
        !          1516:                        printk(" #%d desc. %x %x %8.8x.\n",
        !          1517:                                   i, np->tx_ring[i].status, np->tx_ring[i].ctrl_length,
        !          1518:                                   np->tx_ring[i].buf_addr);
        !          1519:                printk("\n"KERN_DEBUG "  Rx ring %8.8x:\n",
        !          1520:                           (int)virt_to_bus(np->rx_ring));
        !          1521:                for (i = 0; i < RX_RING_SIZE; i++) {
        !          1522:                        printk(KERN_DEBUG " #%d desc. %4.4x %4.4x %8.8x\n",
        !          1523:                                   i, np->rx_ring[i].status, np->rx_ring[i].ctrl_length,
        !          1524:                                   np->rx_ring[i].buf_addr);
        !          1525:                }
        !          1526:        }
        !          1527: #endif /* __i386__ debugging only */
        !          1528: 
        !          1529:        free_irq(dev->irq, dev);
        !          1530: 
        !          1531:        /* Free all the skbuffs in the Rx queue. */
        !          1532:        for (i = 0; i < RX_RING_SIZE; i++) {
        !          1533:                np->rx_ring[i].status = 0;
        !          1534:                np->rx_ring[i].buf_addr = 0xBADF00D0; /* An invalid address. */
        !          1535:                if (np->rx_skbuff[i]) {
        !          1536: #if LINUX_VERSION_CODE < 0x20100
        !          1537:                        np->rx_skbuff[i]->free = 1;
        !          1538: #endif
        !          1539:                        dev_free_skb(np->rx_skbuff[i]);
        !          1540:                }
        !          1541:                np->rx_skbuff[i] = 0;
        !          1542:        }
        !          1543:        for (i = 0; i < TX_RING_SIZE; i++) {
        !          1544:                if (np->tx_skbuff[i])
        !          1545:                        dev_free_skb(np->tx_skbuff[i]);
        !          1546:                np->tx_skbuff[i] = 0;
        !          1547:        }
        !          1548: 
        !          1549:        MOD_DEC_USE_COUNT;
        !          1550: 
        !          1551:        return 0;
        !          1552: }
        !          1553: 
        !          1554: static int netdev_pwr_event(void *dev_instance, int event)
        !          1555: {
        !          1556:        struct net_device *dev = dev_instance;
        !          1557:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1558:        long ioaddr = dev->base_addr;
        !          1559: 
        !          1560:        if (np->msg_level & NETIF_MSG_LINK)
        !          1561:                printk(KERN_DEBUG "%s: Handling power event %d.\n", dev->name, event);
        !          1562:        switch(event) {
        !          1563:        case DRV_ATTACH:
        !          1564:                MOD_INC_USE_COUNT;
        !          1565:                break;
        !          1566:        case DRV_SUSPEND:
        !          1567:                /* Disable interrupts, stop Tx and Rx. */
        !          1568:                writel(0, ioaddr + IntrEnable);
        !          1569:                writel(0, ioaddr + RxConfig);
        !          1570:                break;
        !          1571:        case DRV_RESUME:
        !          1572:                /* This is incomplete: the actions are very chip specific. */
        !          1573:                set_rx_mode(dev);
        !          1574:                writel(np->intr_enable, ioaddr + IntrEnable);
        !          1575:                break;
        !          1576:        case DRV_DETACH: {
        !          1577:                struct net_device **devp, **next;
        !          1578:                if (dev->flags & IFF_UP) {
        !          1579:                        /* Some, but not all, kernel versions close automatically. */
        !          1580:                        dev_close(dev);
        !          1581:                        dev->flags &= ~(IFF_UP|IFF_RUNNING);
        !          1582:                }
        !          1583:                unregister_netdev(dev);
        !          1584:                release_region(dev->base_addr, pci_id_tbl[np->chip_id].io_size);
        !          1585: #ifndef USE_IO_OPS
        !          1586:                iounmap((char *)dev->base_addr);
        !          1587: #endif
        !          1588:                for (devp = &root_net_dev; *devp; devp = next) {
        !          1589:                        next = &((struct netdev_private *)(*devp)->priv)->next_module;
        !          1590:                        if (*devp == dev) {
        !          1591:                                *devp = *next;
        !          1592:                                break;
        !          1593:                        }
        !          1594:                }
        !          1595:                if (np->priv_addr)
        !          1596:                        kfree(np->priv_addr);
        !          1597:                kfree(dev);
        !          1598:                MOD_DEC_USE_COUNT;
        !          1599:                break;
        !          1600:        }
        !          1601:        }
        !          1602: 
        !          1603:        return 0;
        !          1604: }
        !          1605: 
        !          1606: 
        !          1607: #ifdef MODULE
        !          1608: int init_module(void)
        !          1609: {
        !          1610:        if (debug >= NETIF_MSG_DRV)     /* Emit version even if no cards detected. */
        !          1611:                printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
        !          1612:        return pci_drv_register(&myson803_drv_id, NULL);
        !          1613: }
        !          1614: 
        !          1615: void cleanup_module(void)
        !          1616: {
        !          1617:        struct net_device *next_dev;
        !          1618: 
        !          1619:        pci_drv_unregister(&myson803_drv_id);
        !          1620: 
        !          1621:        /* No need to check MOD_IN_USE, as sys_delete_module() checks. */
        !          1622:        while (root_net_dev) {
        !          1623:                struct netdev_private *np = (void *)(root_net_dev->priv);
        !          1624:                unregister_netdev(root_net_dev);
        !          1625: #ifdef USE_IO_OPS
        !          1626:                release_region(root_net_dev->base_addr,
        !          1627:                                           pci_id_tbl[np->chip_id].io_size);
        !          1628: #else
        !          1629:                iounmap((char *)(root_net_dev->base_addr));
        !          1630: #endif
        !          1631:                next_dev = np->next_module;
        !          1632:                if (np->priv_addr)
        !          1633:                        kfree(np->priv_addr);
        !          1634:                kfree(root_net_dev);
        !          1635:                root_net_dev = next_dev;
        !          1636:        }
        !          1637: }
        !          1638: 
        !          1639: #endif  /* MODULE */
        !          1640: 
        !          1641: /*
        !          1642:  * Local variables:
        !          1643:  *  compile-command: "make KERNVER=`uname -r` myson803.o"
        !          1644:  *  compile-cmd: "gcc -DMODULE -Wall -Wstrict-prototypes -O6 -c myson803.c"
        !          1645:  *  simple-compile-command: "gcc -DMODULE -O6 -c myson803.c"
        !          1646:  *  c-indent-level: 4
        !          1647:  *  c-basic-offset: 4
        !          1648:  *  tab-width: 4
        !          1649:  * End:
        !          1650:  */

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.