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

1.1     ! root        1: /* sundance.c: A Linux device driver for the Sundance ST201 "Alta". */
        !             2: /*
        !             3:        Written 1999-2003 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/sundance.html
        !            19: */
        !            20: 
        !            21: /* These identify the driver base version and may not be removed. */
        !            22: static const char version1[] =
        !            23: "sundance.c:v1.11 2/4/2003  Written by Donald Becker <[email protected]>\n";
        !            24: static const char version2[] =
        !            25: "  http://www.scyld.com/network/sundance.html\n";
        !            26: /* Updated to recommendations in pci-skeleton v2.12. */
        !            27: 
        !            28: /* Automatically extracted configuration info:
        !            29: probe-func: sundance_probe
        !            30: config-in: tristate 'Sundance ST201 "Alta" PCI Ethernet support' CONFIG_SUNDANCE
        !            31: c-help-name: Sundance ST201 "Alta" PCI Ethernet support
        !            32: c-help-symbol: CONFIG_SUNDANCE
        !            33: c-help: This driver is for the Sundance ST201 "Alta" and Kendin KS8723, as
        !            34: c-help: used on the D-Link DFE-550 and DFE-580.
        !            35: c-help: Design information, usage details and updates are available from
        !            36: c-help: http://www.scyld.com/network/sundance.html
        !            37: */
        !            38: 
        !            39: /* The user-configurable values.
        !            40:    These may be modified when a driver module is loaded.*/
        !            41: 
        !            42: /* Message enable level: 0..31 = no..all messages.  See NETIF_MSG docs. */
        !            43: static int debug = 2;
        !            44: 
        !            45: /* Maximum events (Rx packets, etc.) to handle at each interrupt. */
        !            46: static int max_interrupt_work = 20;
        !            47: 
        !            48: /* Maximum number of multicast addresses to filter (vs. rx-all-multicast).
        !            49:    The sundance uses a 64 element hash table based on the Ethernet CRC.  */
        !            50: static int multicast_filter_limit = 32;
        !            51: 
        !            52: /* Set the copy breakpoint for the copy-only-tiny-frames scheme.
        !            53:    Setting to > 1518 effectively disables this feature.
        !            54:    This chip can receive into any byte alignment buffers, so word-oriented
        !            55:    archs do not need a copy-align of the IP header. */
        !            56: static int rx_copybreak = 0;
        !            57: 
        !            58: /* Used to pass the media type, etc.
        !            59:    Both 'options[]' and 'full_duplex[]' should exist for driver
        !            60:    interoperability.
        !            61:    The media type is usually passed in 'options[]'.
        !            62:     The default is autonegotation for speed and duplex.
        !            63:        This should rarely be overridden.
        !            64:     Use option values 0x10/0x20 for 10Mbps, 0x100,0x200 for 100Mbps.
        !            65:     Use option values 0x10 and 0x100 for forcing half duplex fixed speed.
        !            66:     Use option values 0x20 and 0x200 for forcing full duplex operation.
        !            67: */
        !            68: #define MAX_UNITS 8            /* More are supported, limit only on options */
        !            69: static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
        !            70: static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
        !            71: 
        !            72: /* Operational parameters that are set at compile time. */
        !            73: 
        !            74: /* Ring sizes are a power of two only for compile efficiency.
        !            75:    The compiler will convert <unsigned>'%'<2^N> into a bit mask.
        !            76:    There must be at least five Tx entries for the tx_full hysteresis, and
        !            77:    more than 31 requires modifying the Tx status handling error recovery.
        !            78:    Leave a inactive gap in the Tx ring for better cache behavior.
        !            79:    Making the Tx ring too large decreases the effectiveness of channel
        !            80:    bonding and packet priority.
        !            81:    Large receive rings waste memory and impact buffer accounting.
        !            82:    The driver need to protect against interrupt latency and the kernel
        !            83:    not reserving enough available memory.
        !            84: */
        !            85: #define TX_RING_SIZE   16
        !            86: #define TX_QUEUE_LEN   10              /* Limit ring entries actually used.  */
        !            87: #define RX_RING_SIZE   32
        !            88: 
        !            89: /* Operational parameters that usually are not changed. */
        !            90: /* Time in jiffies before concluding the transmitter is hung. */
        !            91: #define TX_TIMEOUT  (6*HZ)
        !            92: 
        !            93: /* Allocation size of Rx buffers with normal sized Ethernet frames.
        !            94:    Do not change this value without good reason.  This is not a limit,
        !            95:    but a way to keep a consistent allocation size among drivers.
        !            96:  */
        !            97: #define PKT_BUF_SZ             1536
        !            98: 
        !            99: /* Set iff a MII transceiver on any interface requires mdio preamble.
        !           100:    This only set with older tranceivers, so the extra
        !           101:    code size of a per-interface flag is not worthwhile. */
        !           102: static char mii_preamble_required = 0;
        !           103: 
        !           104: #ifndef __KERNEL__
        !           105: #define __KERNEL__
        !           106: #endif
        !           107: #if !defined(__OPTIMIZE__)
        !           108: #warning  You must compile this file with the correct options!
        !           109: #warning  See the last lines of the source file.
        !           110: #error You must compile this driver with "-O".
        !           111: #endif
        !           112: 
        !           113: /* Include files, designed to support most kernel versions 2.0.0 and later. */
        !           114: #include <linux/config.h>
        !           115: #if defined(CONFIG_SMP) && ! defined(__SMP__)
        !           116: #define __SMP__
        !           117: #endif
        !           118: #if defined(MODULE) && defined(CONFIG_MODVERSIONS) && ! defined(MODVERSIONS)
        !           119: #define MODVERSIONS
        !           120: #endif
        !           121: 
        !           122: #include <linux/version.h>
        !           123: #if defined(MODVERSIONS)
        !           124: #include <linux/modversions.h>
        !           125: #endif
        !           126: #include <linux/module.h>
        !           127: 
        !           128: #include <linux/kernel.h>
        !           129: #include <linux/string.h>
        !           130: #include <linux/timer.h>
        !           131: #include <linux/errno.h>
        !           132: #include <linux/ioport.h>
        !           133: #if LINUX_VERSION_CODE >= 0x20400
        !           134: #include <linux/slab.h>
        !           135: #else
        !           136: #include <linux/malloc.h>
        !           137: #endif
        !           138: #include <linux/interrupt.h>
        !           139: #include <linux/pci.h>
        !           140: #include <linux/netdevice.h>
        !           141: #include <linux/etherdevice.h>
        !           142: #include <linux/skbuff.h>
        !           143: #include <asm/bitops.h>
        !           144: #include <asm/io.h>
        !           145: 
        !           146: #if LINUX_VERSION_CODE >= 0x20300
        !           147: #include <linux/spinlock.h>
        !           148: #elif LINUX_VERSION_CODE >= 0x20200
        !           149: #include <asm/spinlock.h>
        !           150: #endif
        !           151: 
        !           152: #ifdef INLINE_PCISCAN
        !           153: #include "k_compat.h"
        !           154: #else
        !           155: #include "pci-scan.h"
        !           156: #include "kern_compat.h"
        !           157: #endif
        !           158: 
        !           159: /* Condensed operations for readability. */
        !           160: #define virt_to_le32desc(addr)  cpu_to_le32(virt_to_bus(addr))
        !           161: #define le32desc_to_virt(addr)  bus_to_virt(le32_to_cpu(addr))
        !           162: 
        !           163: #if (LINUX_VERSION_CODE >= 0x20100)  &&  defined(MODULE)
        !           164: char kernel_version[] = UTS_RELEASE;
        !           165: #endif
        !           166: 
        !           167: MODULE_AUTHOR("Donald Becker <[email protected]>");
        !           168: MODULE_DESCRIPTION("Sundance Alta Ethernet driver");
        !           169: MODULE_LICENSE("GPL");
        !           170: MODULE_PARM(max_interrupt_work, "i");
        !           171: MODULE_PARM(debug, "i");
        !           172: MODULE_PARM(rx_copybreak, "i");
        !           173: MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
        !           174: MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i");
        !           175: MODULE_PARM(multicast_filter_limit, "i");
        !           176: 
        !           177: MODULE_PARM_DESC(debug, "Driver message level (0-31)");
        !           178: MODULE_PARM_DESC(options, "Force transceiver type or fixed speed+duplex");
        !           179: MODULE_PARM_DESC(max_interrupt_work,
        !           180:                                 "Driver maximum events handled per interrupt");
        !           181: MODULE_PARM_DESC(full_duplex,
        !           182:                                 "Non-zero to set forced full duplex (deprecated).");
        !           183: MODULE_PARM_DESC(rx_copybreak,
        !           184:                                 "Breakpoint in bytes for copy-only-tiny-frames");
        !           185: MODULE_PARM_DESC(multicast_filter_limit,
        !           186:                                 "Multicast addresses before switching to Rx-all-multicast");
        !           187: 
        !           188: /*
        !           189:                                Theory of Operation
        !           190: 
        !           191: I. Board Compatibility
        !           192: 
        !           193: This driver is designed for the Sundance Technologies "Alta" ST201 chip.
        !           194: The Kendin KS8723 is the same design with an integrated transceiver and
        !           195: new quirks.
        !           196: 
        !           197: II. Board-specific settings
        !           198: 
        !           199: This is an all-in-one chip, so there are no board-specific settings.
        !           200: 
        !           201: III. Driver operation
        !           202: 
        !           203: IIIa. Ring buffers
        !           204: 
        !           205: This driver uses two statically allocated fixed-size descriptor lists
        !           206: formed into rings by a branch from the final descriptor to the beginning of
        !           207: the list.  The ring sizes are set at compile time by RX/TX_RING_SIZE.
        !           208: Some chips explicitly use only 2^N sized rings, while others use a
        !           209: 'next descriptor' pointer that the driver forms into rings.
        !           210: 
        !           211: IIIb/c. Transmit/Receive Structure
        !           212: 
        !           213: This driver uses a zero-copy receive and transmit scheme.
        !           214: The driver allocates full frame size skbuffs for the Rx ring buffers at
        !           215: open() time and passes the skb->data field to the chip as receive data
        !           216: buffers.  When an incoming frame is less than RX_COPYBREAK bytes long,
        !           217: a fresh skbuff is allocated and the frame is copied to the new skbuff.
        !           218: When the incoming frame is larger, the skbuff is passed directly up the
        !           219: protocol stack.  Buffers consumed this way are replaced by newly allocated
        !           220: skbuffs in a later phase of receives.
        !           221: 
        !           222: The RX_COPYBREAK value is chosen to trade-off the memory wasted by
        !           223: using a full-sized skbuff for small frames vs. the copying costs of larger
        !           224: frames.  New boards are typically used in generously configured machines
        !           225: and the underfilled buffers have negligible impact compared to the benefit of
        !           226: a single allocation size, so the default value of zero results in never
        !           227: copying packets.  When copying is done, the cost is usually mitigated by using
        !           228: a combined copy/checksum routine.  Copying also preloads the cache, which is
        !           229: most useful with small frames.
        !           230: 
        !           231: A subtle aspect of the operation is that the IP header at offset 14 in an
        !           232: ethernet frame isn't longword aligned for further processing.
        !           233: Unaligned buffers are permitted by the Sundance hardware, so
        !           234: frames are received into the skbuff at an offset of "+2", 16-byte aligning
        !           235: the IP header.
        !           236: 
        !           237: IIId. Synchronization
        !           238: 
        !           239: The driver runs as two independent, single-threaded flows of control.  One
        !           240: is the send-packet routine, which enforces single-threaded use by the
        !           241: dev->tbusy flag.  The other thread is the interrupt handler, which is single
        !           242: threaded by the hardware and interrupt handling software.
        !           243: 
        !           244: The send packet thread has partial control over the Tx ring and 'dev->tbusy'
        !           245: flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
        !           246: queue slot is empty, it clears the tbusy flag when finished otherwise it sets
        !           247: the 'lp->tx_full' flag.
        !           248: 
        !           249: The interrupt handler has exclusive control over the Rx ring and records stats
        !           250: from the Tx ring.  After reaping the stats, it marks the Tx queue entry as
        !           251: empty by incrementing the dirty_tx mark. Iff the 'lp->tx_full' flag is set, it
        !           252: clears both the tx_full and tbusy flags.
        !           253: 
        !           254: IV. Notes
        !           255: 
        !           256: IVb. References
        !           257: 
        !           258: The Sundance ST201 datasheet, preliminary version.
        !           259: The Kendin KS8723 datasheet, preliminary version.
        !           260: http://www.scyld.com/expert/100mbps.html
        !           261: http://www.scyld.com/expert/NWay.html
        !           262: 
        !           263: IVc. Errata
        !           264: 
        !           265: */
        !           266: 
        !           267: 
        !           268: 
        !           269: /* Work-around for Kendin chip bugs.  This will be reversed after tracking
        !           270:  down all of the chip access quirks in memory mode. */
        !           271: #ifndef USE_MEM_OPS
        !           272: #define USE_IO_OPS 1
        !           273: #endif
        !           274: 
        !           275: static void *sundance_probe1(struct pci_dev *pdev, void *init_dev,
        !           276:                                                         long ioaddr, int irq, int chip_idx, int find_cnt);
        !           277: static int sundance_pwr_event(void *dev_instance, int event);
        !           278: 
        !           279: enum chip_capability_flags {CanHaveMII=1, KendinPktDropBug=2, };
        !           280: #ifdef USE_IO_OPS
        !           281: #define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_IO  | PCI_ADDR0)
        !           282: #else
        !           283: #define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_MEM | PCI_ADDR1)
        !           284: #endif
        !           285: 
        !           286: static struct pci_id_info pci_id_tbl[] = {
        !           287:        {"D-Link DFE-580TX (Kendin/Sundance ST201 Alta)",
        !           288:         {0x10021186, 0xffffffff, 0x10121186, 0xffffffff, 0x14, 0xff},
        !           289:         PCI_IOTYPE, 128, CanHaveMII|KendinPktDropBug},
        !           290:        {"D-Link DFE-580TX (Sundance ST201)",
        !           291:         {0x10021186, 0xffffffff, 0x10121186, 0xffffffff, },
        !           292:         PCI_IOTYPE, 128, CanHaveMII|KendinPktDropBug},
        !           293:        {"D-Link DFE-550FX 100baseFx (Sundance ST201)",
        !           294:         {0x10031186, 0xffffffff, },
        !           295:         PCI_IOTYPE, 128, CanHaveMII|KendinPktDropBug},
        !           296:        {"OEM Sundance Technology ST201", {0x10021186, 0xffffffff, },
        !           297:         PCI_IOTYPE, 128, CanHaveMII},
        !           298:        {"Sundance Technology Alta", {0x020113F0, 0xffffffff, },
        !           299:         PCI_IOTYPE, 128, CanHaveMII},
        !           300:        {0,},                                           /* 0 terminated list. */
        !           301: };
        !           302: 
        !           303: struct drv_id_info sundance_drv_id = {
        !           304:        "sundance", PCI_HOTSWAP, PCI_CLASS_NETWORK_ETHERNET<<8, pci_id_tbl,
        !           305:        sundance_probe1, sundance_pwr_event };
        !           306: 
        !           307: /* This driver was written to use PCI memory space, however x86-oriented
        !           308:    hardware often uses I/O space accesses. */
        !           309: #ifdef USE_IO_OPS
        !           310: #undef readb
        !           311: #undef readw
        !           312: #undef readl
        !           313: #undef writeb
        !           314: #undef writew
        !           315: #undef writel
        !           316: #define readb inb
        !           317: #define readw inw
        !           318: #define readl inl
        !           319: #define writeb outb
        !           320: #define writew outw
        !           321: #define writel outl
        !           322: #endif
        !           323: 
        !           324: /* Offsets to the device registers.
        !           325:    Unlike software-only systems, device drivers interact with complex hardware.
        !           326:    It's not useful to define symbolic names for every register bit in the
        !           327:    device.  The name can only partially document the semantics and make
        !           328:    the driver longer and more difficult to read.
        !           329:    In general, only the important configuration values or bits changed
        !           330:    multiple times should be defined symbolically.
        !           331: */
        !           332: enum alta_offsets {
        !           333:        DMACtrl=0x00,     TxListPtr=0x04, TxDMACtrl=0x08, TxDescPoll=0x0a,
        !           334:        RxDMAStatus=0x0c, RxListPtr=0x10, RxDMACtrl=0x14, RxDescPoll=0x16,
        !           335:        LEDCtrl=0x1a, ASICCtrl=0x30,
        !           336:        EEData=0x34, EECtrl=0x36, TxThreshold=0x3c,
        !           337:        FlashAddr=0x40, FlashData=0x44, WakeEvent=0x45, TxStatus=0x46,
        !           338:        DownCounter=0x48, IntrClear=0x4a, IntrEnable=0x4c, IntrStatus=0x4e,
        !           339:        MACCtrl0=0x50, MACCtrl1=0x52, StationAddr=0x54,
        !           340:        MaxFrameSize=0x5A, RxMode=0x5c, MIICtrl=0x5e,
        !           341:        MulticastFilter0=0x60, MulticastFilter1=0x64,
        !           342:        RxOctetsLow=0x68, RxOctetsHigh=0x6a, TxOctetsLow=0x6c, TxOctetsHigh=0x6e,
        !           343:        TxFramesOK=0x70, RxFramesOK=0x72, StatsCarrierError=0x74,
        !           344:        StatsLateColl=0x75, StatsMultiColl=0x76, StatsOneColl=0x77,
        !           345:        StatsTxDefer=0x78, RxMissed=0x79, StatsTxXSDefer=0x7a, StatsTxAbort=0x7b,
        !           346:        StatsBcastTx=0x7c, StatsBcastRx=0x7d, StatsMcastTx=0x7e, StatsMcastRx=0x7f,
        !           347:        /* Aliased and bogus values! */
        !           348:        RxStatus=0x0c,
        !           349: };
        !           350: 
        !           351: /* Bits in the interrupt status/mask registers. */
        !           352: enum intr_status_bits {
        !           353:        IntrSummary=0x0001, IntrPCIErr=0x0002, IntrMACCtrl=0x0008,
        !           354:        IntrTxDone=0x0004, IntrRxDone=0x0010, IntrRxStart=0x0020,
        !           355:        IntrDrvRqst=0x0040,
        !           356:        StatsMax=0x0080, LinkChange=0x0100,
        !           357:        IntrTxDMADone=0x0200, IntrRxDMADone=0x0400,
        !           358: };
        !           359: 
        !           360: /* Bits in the RxMode register. */
        !           361: enum rx_mode_bits {
        !           362:        AcceptAllIPMulti=0x20, AcceptMultiHash=0x10, AcceptAll=0x08,
        !           363:        AcceptBroadcast=0x04, AcceptMulticast=0x02, AcceptMyPhys=0x01,
        !           364: };
        !           365: /* Bits in MACCtrl. */
        !           366: enum mac_ctrl0_bits {
        !           367:        EnbFullDuplex=0x20, EnbRcvLargeFrame=0x40,
        !           368:        EnbFlowCtrl=0x100, EnbPassRxCRC=0x200,
        !           369: };
        !           370: enum mac_ctrl1_bits {
        !           371:        StatsEnable=0x0020,     StatsDisable=0x0040, StatsEnabled=0x0080,
        !           372:        TxEnable=0x0100, TxDisable=0x0200, TxEnabled=0x0400,
        !           373:        RxEnable=0x0800, RxDisable=0x1000, RxEnabled=0x2000,
        !           374: };
        !           375: 
        !           376: /* The Rx and Tx buffer descriptors.
        !           377:    Using only 32 bit fields simplifies software endian correction.
        !           378:    This structure must be aligned, and should avoid spanning cache lines.
        !           379: */
        !           380: struct netdev_desc {
        !           381:        u32 next_desc;
        !           382:        u32 status;
        !           383:        struct desc_frag { u32 addr, length; } frag[1];
        !           384: };
        !           385: 
        !           386: /* Bits in netdev_desc.status */
        !           387: enum desc_status_bits {
        !           388:        DescOwn=0x8000, DescEndPacket=0x4000, DescEndRing=0x2000,
        !           389:        DescTxDMADone=0x10000,
        !           390:        LastFrag=0x80000000, DescIntrOnTx=0x8000, DescIntrOnDMADone=0x80000000,
        !           391: };
        !           392: 
        !           393: #define PRIV_ALIGN     15      /* Required alignment mask */
        !           394: /* Use  __attribute__((aligned (L1_CACHE_BYTES)))  to maintain alignment
        !           395:    within the structure. */
        !           396: struct netdev_private {
        !           397:        /* Descriptor rings first for alignment. */
        !           398:        struct netdev_desc rx_ring[RX_RING_SIZE];
        !           399:        struct netdev_desc tx_ring[TX_RING_SIZE];
        !           400:        struct net_device *next_module;         /* Link for devices of this type. */
        !           401:        void *priv_addr;                                        /* Unaligned address for kfree */
        !           402:        const char *product_name;
        !           403:        /* The addresses of receive-in-place skbuffs. */
        !           404:        struct sk_buff* rx_skbuff[RX_RING_SIZE];
        !           405:        /* The saved address of a sent-in-place packet/buffer, for later free(). */
        !           406:        struct sk_buff* tx_skbuff[TX_RING_SIZE];
        !           407:        struct net_device_stats stats;
        !           408:        struct timer_list timer;        /* Media monitoring timer. */
        !           409:        /* Frequently used values: keep some adjacent for cache effect. */
        !           410:        int msg_level;
        !           411:        int chip_id, drv_flags;
        !           412:        struct pci_dev *pci_dev;
        !           413:        int max_interrupt_work;
        !           414: 
        !           415:        /* Note: Group variables for cache line effect. */
        !           416:        struct netdev_desc *rx_head_desc;
        !           417:        unsigned int cur_rx, dirty_rx;          /* Producer/consumer ring indices */
        !           418:        unsigned int rx_buf_sz;                         /* Based on MTU+slack. */
        !           419:        int rx_copybreak;
        !           420: 
        !           421:        spinlock_t txlock;                                      /* Group with Tx control cache line. */
        !           422:        struct netdev_desc *last_tx;            /* Last Tx descriptor used. */
        !           423:        unsigned int cur_tx, dirty_tx;
        !           424:        unsigned int tx_full:1;                         /* The Tx queue is full. */
        !           425: 
        !           426:        /* These values keep track of the transceiver/media in use. */
        !           427:        unsigned int full_duplex:1;                     /* Full-duplex operation requested. */
        !           428:        unsigned int duplex_lock:1;
        !           429:        unsigned int medialock:1;                       /* Do not sense media. */
        !           430:        unsigned int default_port;                      /* Last dev->if_port value. */
        !           431:        /* Multicast and receive mode. */
        !           432:        spinlock_t mcastlock;                           /* SMP lock multicast updates. */
        !           433:        u16 mcast_filter[4];
        !           434:        int multicast_filter_limit;
        !           435: 
        !           436:        /* MII transceiver section. */
        !           437:        int mii_cnt;                                            /* MII device addresses. */
        !           438:        int link_status;
        !           439:        u16 advertising;                                        /* NWay media advertisement */
        !           440:        unsigned char phys[2];                          /* MII device addresses. */
        !           441: };
        !           442: 
        !           443: /* The station address location in the EEPROM. */
        !           444: #define EEPROM_SA_OFFSET       0x10
        !           445: 
        !           446: static int  eeprom_read(long ioaddr, int location);
        !           447: static int  mdio_read(struct net_device *dev, int phy_id,
        !           448:                                          unsigned int location);
        !           449: static void mdio_write(struct net_device *dev, int phy_id,
        !           450:                                           unsigned int location, int value);
        !           451: static int  netdev_open(struct net_device *dev);
        !           452: static void sundance_start(struct net_device *dev);
        !           453: static int  change_mtu(struct net_device *dev, int new_mtu);
        !           454: static void check_duplex(struct net_device *dev);
        !           455: static void netdev_timer(unsigned long data);
        !           456: static void tx_timeout(struct net_device *dev);
        !           457: static void init_ring(struct net_device *dev);
        !           458: static int  start_tx(struct sk_buff *skb, struct net_device *dev);
        !           459: static void intr_handler(int irq, void *dev_instance, struct pt_regs *regs);
        !           460: static void netdev_error(struct net_device *dev, int intr_status);
        !           461: static int  netdev_rx(struct net_device *dev);
        !           462: static void netdev_error(struct net_device *dev, int intr_status);
        !           463: static void set_rx_mode(struct net_device *dev);
        !           464: static struct net_device_stats *get_stats(struct net_device *dev);
        !           465: static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
        !           466: static int  netdev_close(struct net_device *dev);
        !           467: 
        !           468: 
        !           469: 
        !           470: /* A list of our installed devices, for removing the driver module. */
        !           471: static struct net_device *root_net_dev = NULL;
        !           472: 
        !           473: #ifndef MODULE
        !           474: int sundance_probe(struct net_device *dev)
        !           475: {
        !           476:        if (pci_drv_register(&sundance_drv_id, dev) < 0)
        !           477:                return -ENODEV;
        !           478:        if (debug >= NETIF_MSG_DRV)     /* Emit version even if no cards detected. */
        !           479:                printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
        !           480:        return 0;
        !           481: }
        !           482: #endif
        !           483: 
        !           484: static void *sundance_probe1(struct pci_dev *pdev, void *init_dev,
        !           485:                                                         long ioaddr, int irq, int chip_idx, int card_idx)
        !           486: {
        !           487:        struct net_device *dev;
        !           488:        struct netdev_private *np;
        !           489:        void *priv_mem;
        !           490:        int i, option = card_idx < MAX_UNITS ? options[card_idx] : 0;
        !           491: 
        !           492:        dev = init_etherdev(init_dev, 0);
        !           493:        if (!dev)
        !           494:                return NULL;
        !           495: 
        !           496:        /* Perhaps NETIF_MSG_PROBE */
        !           497:        printk(KERN_INFO "%s: %s at 0x%lx, ",
        !           498:                   dev->name, pci_id_tbl[chip_idx].name, ioaddr);
        !           499: 
        !           500:        for (i = 0; i < 3; i++)
        !           501:                ((u16 *)dev->dev_addr)[i] =
        !           502:                        le16_to_cpu(eeprom_read(ioaddr, i + EEPROM_SA_OFFSET));
        !           503:        for (i = 0; i < 5; i++)
        !           504:                printk("%2.2x:", dev->dev_addr[i]);
        !           505:        printk("%2.2x, IRQ %d.\n", dev->dev_addr[i], irq);
        !           506: 
        !           507:        /* Make certain elements e.g. descriptor lists are aligned. */
        !           508:        priv_mem = kmalloc(sizeof(*np) + PRIV_ALIGN, GFP_KERNEL);
        !           509:        /* Check for the very unlikely case of no memory. */
        !           510:        if (priv_mem == NULL)
        !           511:                return NULL;
        !           512: 
        !           513:        /* All failure checks before this point.
        !           514:           We do a request_region() only to register /proc/ioports info. */
        !           515: #ifdef USE_IO_OPS
        !           516:        request_region(ioaddr, pci_id_tbl[chip_idx].io_size, dev->name);
        !           517: #endif
        !           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:        if (card_idx < MAX_UNITS  &&  full_duplex[card_idx] > 0)
        !           541:                np->full_duplex = 1;
        !           542: 
        !           543:        if (np->full_duplex)
        !           544:                np->medialock = 1;
        !           545: 
        !           546:        /* The chip-specific entries in the device structure. */
        !           547:        dev->open = &netdev_open;
        !           548:        dev->hard_start_xmit = &start_tx;
        !           549:        dev->stop = &netdev_close;
        !           550:        dev->get_stats = &get_stats;
        !           551:        dev->set_multicast_list = &set_rx_mode;
        !           552:        dev->do_ioctl = &mii_ioctl;
        !           553:        dev->change_mtu = &change_mtu;
        !           554: 
        !           555:        if (1) {
        !           556:                int phy, phy_idx = 0;
        !           557:                np->phys[0] = 1;                /* Default setting */
        !           558:                mii_preamble_required++;
        !           559:                for (phy = 1; phy < 32 && phy_idx < 4; phy++) {
        !           560:                        int mii_status = mdio_read(dev, phy, 1);
        !           561:                        if (mii_status != 0xffff  &&  mii_status != 0x0000) {
        !           562:                                np->phys[phy_idx++] = phy;
        !           563:                                np->advertising = mdio_read(dev, phy, 4);
        !           564:                                if ((mii_status & 0x0040) == 0)
        !           565:                                        mii_preamble_required++;
        !           566:                                if (np->msg_level & NETIF_MSG_PROBE)
        !           567:                                        printk(KERN_INFO "%s: MII PHY found at address %d, status "
        !           568:                                                   "0x%4.4x advertising %4.4x.\n",
        !           569:                                                   dev->name, phy, mii_status, np->advertising);
        !           570:                        }
        !           571:                }
        !           572:                mii_preamble_required--;
        !           573:                np->mii_cnt = phy_idx;
        !           574:                if (phy_idx == 0)
        !           575:                        printk(KERN_INFO "%s: No MII transceiver found!, ASIC status %x\n",
        !           576:                                   dev->name, (int)readl(ioaddr + ASICCtrl));
        !           577:        }
        !           578: 
        !           579:        /* Allow forcing the media type. */
        !           580:        if (option > 0) {
        !           581:                if (option & 0x220)
        !           582:                        np->full_duplex = 1;
        !           583:                np->default_port = option & 0x3ff;
        !           584:                if (np->default_port & 0x330) {
        !           585:                        np->medialock = 1;
        !           586:                        if (np->msg_level & NETIF_MSG_PROBE)
        !           587:                                printk(KERN_INFO "  Forcing %dMbs %s-duplex operation.\n",
        !           588:                                           (option & 0x300 ? 100 : 10),
        !           589:                                           (np->full_duplex ? "full" : "half"));
        !           590:                        if (np->mii_cnt)
        !           591:                                mdio_write(dev, np->phys[0], 0,
        !           592:                                                   ((option & 0x300) ? 0x2000 : 0) |    /* 100mbps? */
        !           593:                                                   (np->full_duplex ? 0x0100 : 0)); /* Full duplex? */
        !           594:                }
        !           595:        }
        !           596: 
        !           597:        /* Reset the chip to erase previous misconfiguration. */
        !           598:        if (np->msg_level & NETIF_MSG_MISC)
        !           599:                printk("ASIC Control is %x.\n", (int)readl(ioaddr + ASICCtrl));
        !           600:        writel(0x007f0000 | readl(ioaddr + ASICCtrl), ioaddr + ASICCtrl);
        !           601:        if (np->msg_level & NETIF_MSG_MISC)
        !           602:                printk("ASIC Control is now %x.\n", (int)readl(ioaddr + ASICCtrl));
        !           603: 
        !           604:        return dev;
        !           605: }
        !           606: 
        !           607: 
        !           608: 
        !           609: static int change_mtu(struct net_device *dev, int new_mtu)
        !           610: {
        !           611:        if ((new_mtu < 68) || (new_mtu > 8191)) /* Limited by RxDMAFrameLen */
        !           612:                return -EINVAL;
        !           613:        if (netif_running(dev))
        !           614:                return -EBUSY;
        !           615:        dev->mtu = new_mtu;
        !           616:        return 0;
        !           617: }
        !           618: 
        !           619: /* Read the EEPROM and MII Management Data I/O (MDIO) interfaces. */
        !           620: static int eeprom_read(long ioaddr, int location)
        !           621: {
        !           622:        int boguscnt = 2000;            /* Typical 190 ticks. */
        !           623:        writew(0x0200 | (location & 0xff), ioaddr + EECtrl);
        !           624:        do {
        !           625:                if (! (readw(ioaddr + EECtrl) & 0x8000)) {
        !           626:                        return readw(ioaddr + EEData);
        !           627:                }
        !           628:        } while (--boguscnt > 0);
        !           629:        return 0;
        !           630: }
        !           631: 
        !           632: /*  MII transceiver control section.
        !           633:        Read and write the MII registers using software-generated serial
        !           634:        MDIO protocol.  See the MII specifications or DP83840A data sheet
        !           635:        for details.
        !           636: 
        !           637:        The maximum data clock rate is 2.5 Mhz.
        !           638:        The timing is decoupled from the processor clock by flushing the write
        !           639:        from the CPU write buffer with a following read, and using PCI
        !           640:        transaction time. */
        !           641: #define mdio_in(mdio_addr) readb(mdio_addr)
        !           642: #define mdio_out(value, mdio_addr) writeb(value, mdio_addr)
        !           643: #define mdio_delay(mdio_addr) readb(mdio_addr)
        !           644: 
        !           645: enum mii_reg_bits {
        !           646:        MDIO_ShiftClk=0x0001, MDIO_Data=0x0002, MDIO_EnbOutput=0x0004,
        !           647: };
        !           648: #define MDIO_EnbIn  (0)
        !           649: #define MDIO_WRITE0 (MDIO_EnbOutput)
        !           650: #define MDIO_WRITE1 (MDIO_Data | MDIO_EnbOutput)
        !           651: 
        !           652: /* Generate the preamble required for initial synchronization and
        !           653:    a few older transceivers. */
        !           654: static void mdio_sync(long mdio_addr)
        !           655: {
        !           656:        int bits = 32;
        !           657: 
        !           658:        /* Establish sync by sending at least 32 logic ones. */
        !           659:        while (--bits >= 0) {
        !           660:                mdio_out(MDIO_WRITE1, mdio_addr);
        !           661:                mdio_delay(mdio_addr);
        !           662:                mdio_out(MDIO_WRITE1 | MDIO_ShiftClk, mdio_addr);
        !           663:                mdio_delay(mdio_addr);
        !           664:        }
        !           665: }
        !           666: 
        !           667: static int mdio_read(struct net_device *dev, int phy_id, unsigned int location)
        !           668: {
        !           669:        long mdio_addr = dev->base_addr + MIICtrl;
        !           670:        int mii_cmd = (0xf6 << 10) | (phy_id << 5) | location;
        !           671:        int i, retval = 0;
        !           672: 
        !           673:        if (mii_preamble_required)
        !           674:                mdio_sync(mdio_addr);
        !           675: 
        !           676:        /* Shift the read command bits out. */
        !           677:        for (i = 15; i >= 0; i--) {
        !           678:                int dataval = (mii_cmd & (1 << i)) ? MDIO_WRITE1 : MDIO_WRITE0;
        !           679: 
        !           680:                mdio_out(dataval, mdio_addr);
        !           681:                mdio_delay(mdio_addr);
        !           682:                mdio_out(dataval | MDIO_ShiftClk, mdio_addr);
        !           683:                mdio_delay(mdio_addr);
        !           684:        }
        !           685:        /* Read the two transition, 16 data, and wire-idle bits. */
        !           686:        for (i = 19; i > 0; i--) {
        !           687:                mdio_out(MDIO_EnbIn, mdio_addr);
        !           688:                mdio_delay(mdio_addr);
        !           689:                retval = (retval << 1) | ((mdio_in(mdio_addr) & MDIO_Data) ? 1 : 0);
        !           690:                mdio_out(MDIO_EnbIn | MDIO_ShiftClk, mdio_addr);
        !           691:                mdio_delay(mdio_addr);
        !           692:        }
        !           693:        return (retval>>1) & 0xffff;
        !           694: }
        !           695: 
        !           696: static void mdio_write(struct net_device *dev, int phy_id,
        !           697:                                           unsigned int location, int value)
        !           698: {
        !           699:        long mdio_addr = dev->base_addr + MIICtrl;
        !           700:        int mii_cmd = (0x5002 << 16) | (phy_id << 23) | (location<<18) | value;
        !           701:        int i;
        !           702: 
        !           703:        if (mii_preamble_required)
        !           704:                mdio_sync(mdio_addr);
        !           705: 
        !           706:        /* Shift the command bits out. */
        !           707:        for (i = 31; i >= 0; i--) {
        !           708:                int dataval = (mii_cmd & (1 << i)) ? MDIO_WRITE1 : MDIO_WRITE0;
        !           709: 
        !           710:                mdio_out(dataval, mdio_addr);
        !           711:                mdio_delay(mdio_addr);
        !           712:                mdio_out(dataval | MDIO_ShiftClk, mdio_addr);
        !           713:                mdio_delay(mdio_addr);
        !           714:        }
        !           715:        /* Clear out extra bits. */
        !           716:        for (i = 2; i > 0; i--) {
        !           717:                mdio_out(MDIO_EnbIn, mdio_addr);
        !           718:                mdio_delay(mdio_addr);
        !           719:                mdio_out(MDIO_EnbIn | MDIO_ShiftClk, mdio_addr);
        !           720:                mdio_delay(mdio_addr);
        !           721:        }
        !           722:        return;
        !           723: }
        !           724: 
        !           725: 
        !           726: static int netdev_open(struct net_device *dev)
        !           727: {
        !           728:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           729:        long ioaddr = dev->base_addr;
        !           730: 
        !           731:        MOD_INC_USE_COUNT;
        !           732: 
        !           733:        if (request_irq(dev->irq, &intr_handler, SA_SHIRQ, dev->name, dev)) {
        !           734:                MOD_DEC_USE_COUNT;
        !           735:                return -EAGAIN;
        !           736:        }
        !           737: 
        !           738:        if (np->msg_level & NETIF_MSG_IFUP)
        !           739:                printk(KERN_DEBUG "%s: netdev_open() irq %d.\n",
        !           740:                           dev->name, dev->irq);
        !           741: 
        !           742:        init_ring(dev);
        !           743: 
        !           744:        if (dev->if_port == 0)
        !           745:                dev->if_port = np->default_port;
        !           746: 
        !           747:        np->full_duplex = np->duplex_lock;
        !           748:        np->mcastlock = (spinlock_t) SPIN_LOCK_UNLOCKED;
        !           749: 
        !           750:        sundance_start(dev);
        !           751:        netif_start_tx_queue(dev);
        !           752: 
        !           753:        if (np->msg_level & NETIF_MSG_IFUP)
        !           754:                printk(KERN_DEBUG "%s: Done netdev_open(), status: Rx %x Tx %x "
        !           755:                           "MAC Control %x, %4.4x %4.4x.\n",
        !           756:                           dev->name, (int)readl(ioaddr + RxStatus),
        !           757:                           (int)readw(ioaddr + TxStatus), (int)readl(ioaddr + MACCtrl0),
        !           758:                           (int)readw(ioaddr + MACCtrl1), (int)readw(ioaddr + MACCtrl0));
        !           759: 
        !           760:        /* Set the timer to check for link beat. */
        !           761:        init_timer(&np->timer);
        !           762:        np->timer.expires = jiffies + 3*HZ;
        !           763:        np->timer.data = (unsigned long)dev;
        !           764:        np->timer.function = &netdev_timer;                             /* timer handler */
        !           765:        add_timer(&np->timer);
        !           766: 
        !           767:        return 0;
        !           768: }
        !           769: 
        !           770: static void sundance_start(struct net_device *dev)
        !           771: {
        !           772:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           773:        long ioaddr = dev->base_addr;
        !           774:        int i;
        !           775: 
        !           776:        /* No reports have indicated that we need to reset the chip. */
        !           777: 
        !           778:        writel(virt_to_bus(&np->rx_ring[np->cur_rx % RX_RING_SIZE]),
        !           779:                   ioaddr + RxListPtr);
        !           780:        /* The Tx list pointer is written as packets are queued. */
        !           781: 
        !           782:        /* Station address must be written as 16 bit words with the Kendin chip. */
        !           783:        for (i = 0; i < 6; i += 2)
        !           784:                writew((dev->dev_addr[i + 1] << 8) + dev->dev_addr[i],
        !           785:                           ioaddr + StationAddr + i);
        !           786: 
        !           787:        np->link_status = readb(ioaddr + MIICtrl) & 0xE0;
        !           788:        writew((np->full_duplex || (np->link_status & 0x20)) ? 0x120 : 0,
        !           789:                   ioaddr + MACCtrl0);
        !           790:        writew(dev->mtu + 14, ioaddr + MaxFrameSize);
        !           791:        if (dev->mtu > 2047)
        !           792:                writel(readl(ioaddr + ASICCtrl) | 0x0C, ioaddr + ASICCtrl);
        !           793: 
        !           794:        set_rx_mode(dev);
        !           795:        writew(0, ioaddr + DownCounter);
        !           796:        /* Set the chip to poll every N*320nsec. */
        !           797:        writeb(100, ioaddr + RxDescPoll);
        !           798:        writeb(127, ioaddr + TxDescPoll);
        !           799: #if 0
        !           800:        if (np->drv_flags & KendinPktDropBug)
        !           801:                writeb(0x01, ioaddr + DebugCtrl1);
        !           802: #endif
        !           803: 
        !           804:        /* Enable interrupts by setting the interrupt mask. */
        !           805:        writew(IntrRxDMADone | IntrPCIErr | IntrDrvRqst | IntrTxDone
        !           806:                   | StatsMax | LinkChange, ioaddr + IntrEnable);
        !           807:        writew(StatsEnable | RxEnable | TxEnable, ioaddr + MACCtrl1);
        !           808: }
        !           809: 
        !           810: static void check_duplex(struct net_device *dev)
        !           811: {
        !           812:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           813:        long ioaddr = dev->base_addr;
        !           814:        int mii_reg5 = mdio_read(dev, np->phys[0], 5);
        !           815:        int negotiated = mii_reg5 & np->advertising;
        !           816:        int duplex;
        !           817: 
        !           818:        if (np->duplex_lock  ||  mii_reg5 == 0xffff)
        !           819:                return;
        !           820:        duplex = (negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040;
        !           821:        if (np->full_duplex != duplex) {
        !           822:                np->full_duplex = duplex;
        !           823:                if (np->msg_level & NETIF_MSG_LINK)
        !           824:                        printk(KERN_INFO "%s: Setting %s-duplex based on MII #%d "
        !           825:                                   "negotiated capability %4.4x.\n", dev->name,
        !           826:                                   duplex ? "full" : "half", np->phys[0], negotiated);
        !           827:                writew(duplex ? 0x20 : 0, ioaddr + MACCtrl0);
        !           828:        }
        !           829: }
        !           830: 
        !           831: static void netdev_timer(unsigned long data)
        !           832: {
        !           833:        struct net_device *dev = (struct net_device *)data;
        !           834:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           835:        long ioaddr = dev->base_addr;
        !           836:        int next_tick = 10*HZ;
        !           837: 
        !           838:        if (np->msg_level & NETIF_MSG_TIMER) {
        !           839:                printk(KERN_DEBUG "%s: Media selection timer tick, intr status %4.4x, "
        !           840:                           "Tx %x Rx %x.\n",
        !           841:                           dev->name, (int)readw(ioaddr + IntrEnable),
        !           842:                           (int)readw(ioaddr + TxStatus), (int)readl(ioaddr + RxStatus));
        !           843:        }
        !           844:        /* Note: This does not catch a 0 or 1 element stuck queue. */
        !           845:        if (netif_queue_paused(dev)  &&
        !           846:                np->cur_tx - np->dirty_tx > 1  &&
        !           847:                (jiffies - dev->trans_start) > TX_TIMEOUT) {
        !           848:                tx_timeout(dev);
        !           849:        }
        !           850:        check_duplex(dev);
        !           851:        np->timer.expires = jiffies + next_tick;
        !           852:        add_timer(&np->timer);
        !           853: }
        !           854: 
        !           855: static void tx_timeout(struct net_device *dev)
        !           856: {
        !           857:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           858:        long ioaddr = dev->base_addr;
        !           859: 
        !           860:        printk(KERN_WARNING "%s: Transmit timed out, status %4.4x,"
        !           861:                   " resetting...\n", dev->name, (int)readw(ioaddr + TxStatus));
        !           862: 
        !           863: #ifdef __i386__
        !           864:        if (np->msg_level & NETIF_MSG_TX_ERR) {
        !           865:                int i;
        !           866:                printk(KERN_DEBUG "  Rx ring %8.8x: ", (int)np->rx_ring);
        !           867:                for (i = 0; i < RX_RING_SIZE; i++)
        !           868:                        printk(" %8.8x", (unsigned int)np->rx_ring[i].status);
        !           869:                printk("\n"KERN_DEBUG"  Tx ring %8.8x: ", (int)np->tx_ring);
        !           870:                for (i = 0; i < TX_RING_SIZE; i++)
        !           871:                        printk(" %8.8x", np->tx_ring[i].status);
        !           872:                printk("\n");
        !           873:        }
        !           874: #endif
        !           875: 
        !           876:        /* Perhaps we should reinitialize the hardware here. */
        !           877:        dev->if_port = 0;
        !           878:        /* Stop and restart the chip's Tx processes . */
        !           879: 
        !           880:        /* Trigger an immediate transmit demand. */
        !           881:        writew(IntrRxDMADone | IntrPCIErr | IntrDrvRqst | IntrTxDone
        !           882:                   | StatsMax | LinkChange, ioaddr + IntrEnable);
        !           883: 
        !           884:        dev->trans_start = jiffies;
        !           885:        np->stats.tx_errors++;
        !           886:        return;
        !           887: }
        !           888: 
        !           889: 
        !           890: /* Initialize the Rx and Tx rings, along with various 'dev' bits. */
        !           891: static void init_ring(struct net_device *dev)
        !           892: {
        !           893:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           894:        int i;
        !           895: 
        !           896:        np->tx_full = 0;
        !           897:        np->cur_rx = np->cur_tx = 0;
        !           898:        np->dirty_rx = np->dirty_tx = 0;
        !           899: 
        !           900:        np->rx_buf_sz = dev->mtu + 20;
        !           901:        if (np->rx_buf_sz < PKT_BUF_SZ)
        !           902:                np->rx_buf_sz = PKT_BUF_SZ;
        !           903:        np->rx_head_desc = &np->rx_ring[0];
        !           904: 
        !           905:        /* Initialize all Rx descriptors. */
        !           906:        for (i = 0; i < RX_RING_SIZE; i++) {
        !           907:                np->rx_ring[i].next_desc = virt_to_le32desc(&np->rx_ring[i+1]);
        !           908:                np->rx_ring[i].status = 0;
        !           909:                np->rx_ring[i].frag[0].length = 0;
        !           910:                np->rx_skbuff[i] = 0;
        !           911:        }
        !           912:        /* Wrap the ring. */
        !           913:        np->rx_ring[i-1].next_desc = virt_to_le32desc(&np->rx_ring[0]);
        !           914: 
        !           915:        /* Fill in the Rx buffers.  Handle allocation failure gracefully. */
        !           916:        for (i = 0; i < RX_RING_SIZE; i++) {
        !           917:                struct sk_buff *skb = dev_alloc_skb(np->rx_buf_sz);
        !           918:                np->rx_skbuff[i] = skb;
        !           919:                if (skb == NULL)
        !           920:                        break;
        !           921:                skb->dev = dev;                 /* Mark as being used by this device. */
        !           922:                skb_reserve(skb, 2);    /* 16 byte align the IP header. */
        !           923:                np->rx_ring[i].frag[0].addr = virt_to_le32desc(skb->tail);
        !           924:                np->rx_ring[i].frag[0].length = cpu_to_le32(np->rx_buf_sz | LastFrag);
        !           925:        }
        !           926:        np->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
        !           927: 
        !           928:        for (i = 0; i < TX_RING_SIZE; i++) {
        !           929:                np->tx_skbuff[i] = 0;
        !           930:                np->tx_ring[i].status = 0;
        !           931:        }
        !           932:        return;
        !           933: }
        !           934: 
        !           935: static int start_tx(struct sk_buff *skb, struct net_device *dev)
        !           936: {
        !           937:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           938:        struct netdev_desc *txdesc;
        !           939:        unsigned entry;
        !           940: 
        !           941:        /* Block a timer-based transmit from overlapping. */
        !           942:        if (netif_pause_tx_queue(dev) != 0) {
        !           943:                /* This watchdog code is redundant with the media monitor timer. */
        !           944:                if (jiffies - dev->trans_start > TX_TIMEOUT)
        !           945:                        tx_timeout(dev);
        !           946:                return 1;
        !           947:        }
        !           948: 
        !           949:        /* Note: Ordering is important here, set the field with the
        !           950:           "ownership" bit last, and only then increment cur_tx. */
        !           951: 
        !           952:        /* Calculate the next Tx descriptor entry. */
        !           953:        entry = np->cur_tx % TX_RING_SIZE;
        !           954:        np->tx_skbuff[entry] = skb;
        !           955:        txdesc = &np->tx_ring[entry];
        !           956: 
        !           957:        txdesc->next_desc = 0;
        !           958:        /* Note: disable the interrupt generation here before releasing. */
        !           959:        txdesc->status =
        !           960:                cpu_to_le32((entry<<2) | DescIntrOnDMADone | DescIntrOnTx | 1);
        !           961:        txdesc->frag[0].addr = virt_to_le32desc(skb->data);
        !           962:        txdesc->frag[0].length = cpu_to_le32(skb->len | LastFrag);
        !           963:        if (np->last_tx)
        !           964:                np->last_tx->next_desc = virt_to_le32desc(txdesc);
        !           965:        np->last_tx = txdesc;
        !           966:        np->cur_tx++;
        !           967: 
        !           968:        /* On some architectures: explicitly flush cache lines here. */
        !           969: 
        !           970:        if (np->cur_tx - np->dirty_tx >= TX_QUEUE_LEN - 1) {
        !           971:                np->tx_full = 1;
        !           972:                /* Check for a just-cleared queue. */
        !           973:                if (np->cur_tx - (volatile unsigned int)np->dirty_tx
        !           974:                        < TX_QUEUE_LEN - 2) {
        !           975:                        np->tx_full = 0;
        !           976:                        netif_unpause_tx_queue(dev);
        !           977:                } else
        !           978:                        netif_stop_tx_queue(dev);
        !           979:        } else
        !           980:                netif_unpause_tx_queue(dev);            /* Typical path */
        !           981: 
        !           982:        /* Side effect: The read wakes the potentially-idle transmit channel. */
        !           983:        if (readl(dev->base_addr + TxListPtr) == 0)
        !           984:                writel(virt_to_bus(&np->tx_ring[entry]), dev->base_addr + TxListPtr);
        !           985: 
        !           986:        dev->trans_start = jiffies;
        !           987: 
        !           988:        if (np->msg_level & NETIF_MSG_TX_QUEUED) {
        !           989:                printk(KERN_DEBUG "%s: Transmit frame #%d len %ld queued in slot %ld.\n",
        !           990:                           dev->name, np->cur_tx, skb->len, entry);
        !           991:        }
        !           992:        return 0;
        !           993: }
        !           994: 
        !           995: /* The interrupt handler does all of the Rx thread work and cleans up
        !           996:    after the Tx thread. */
        !           997: static void intr_handler(int irq, void *dev_instance, struct pt_regs *rgs)
        !           998: {
        !           999:        struct net_device *dev = (struct net_device *)dev_instance;
        !          1000:        struct netdev_private *np;
        !          1001:        long ioaddr;
        !          1002:        int boguscnt;
        !          1003: 
        !          1004:        ioaddr = dev->base_addr;
        !          1005:        np = (struct netdev_private *)dev->priv;
        !          1006:        boguscnt = np->max_interrupt_work;
        !          1007: 
        !          1008:        do {
        !          1009:                int intr_status = readw(ioaddr + IntrStatus);
        !          1010:                if ((intr_status & ~IntrRxDone) == 0 || intr_status == 0xffff)
        !          1011:                        break;
        !          1012: 
        !          1013:                writew(intr_status & (IntrRxDMADone | IntrPCIErr |
        !          1014:                                                          IntrDrvRqst |IntrTxDone|IntrTxDMADone |
        !          1015:                                                          StatsMax | LinkChange),
        !          1016:                                                          ioaddr + IntrStatus);
        !          1017: 
        !          1018:                if (np->msg_level & NETIF_MSG_INTR)
        !          1019:                        printk(KERN_DEBUG "%s: Interrupt, status %4.4x.\n",
        !          1020:                                   dev->name, intr_status);
        !          1021: 
        !          1022:                if (intr_status & IntrRxDMADone)
        !          1023:                        netdev_rx(dev);
        !          1024: 
        !          1025:                if (intr_status & IntrTxDone) {
        !          1026:                        int txboguscnt = 32;
        !          1027:                        int tx_status = readw(ioaddr + TxStatus);
        !          1028:                        while (tx_status & 0x80) {
        !          1029:                                if (np->msg_level & NETIF_MSG_TX_DONE)
        !          1030:                                        printk("%s: Transmit status is %4.4x.\n",
        !          1031:                                                   dev->name, tx_status);
        !          1032:                                if (tx_status & 0x1e) {
        !          1033:                                        if (np->msg_level & NETIF_MSG_TX_ERR)
        !          1034:                                                printk("%s: Transmit error status %4.4x.\n",
        !          1035:                                                           dev->name, tx_status);
        !          1036:                                        np->stats.tx_errors++;
        !          1037:                                        if (tx_status & 0x10)  np->stats.tx_fifo_errors++;
        !          1038: #ifdef ETHER_STATS
        !          1039:                                        if (tx_status & 0x08)  np->stats.collisions16++;
        !          1040: #else
        !          1041:                                        if (tx_status & 0x08)  np->stats.collisions++;
        !          1042: #endif
        !          1043:                                        if (tx_status & 0x04)  np->stats.tx_fifo_errors++;
        !          1044:                                        if (tx_status & 0x02)  np->stats.tx_window_errors++;
        !          1045:                                        /* This reset has not been verified!. */
        !          1046:                                        if (tx_status & 0x10) {                 /* Reset the Tx. */
        !          1047:                                                writel(0x001c0000 | readl(ioaddr + ASICCtrl),
        !          1048:                                                           ioaddr + ASICCtrl);
        !          1049: #if 0                                  /* Do we need to reset the Tx pointer here? */
        !          1050:                                                writel(virt_to_bus(&np->tx_ring[np->dirty_tx]),
        !          1051:                                                           dev->base_addr + TxListPtr);
        !          1052: #endif
        !          1053:                                        }
        !          1054:                                        if (tx_status & 0x1e)           /* Restart the Tx. */
        !          1055:                                                writew(TxEnable, ioaddr + MACCtrl1);
        !          1056:                                }
        !          1057:                                /* Yup, this is a documentation bug.  It cost me *hours*. */
        !          1058:                                writew(0, ioaddr + TxStatus);
        !          1059:                                if (--txboguscnt < 0)
        !          1060:                                        break;
        !          1061:                                tx_status = readw(ioaddr + TxStatus);
        !          1062:                        }
        !          1063:                }
        !          1064:                for (; np->cur_tx - np->dirty_tx > 0; np->dirty_tx++) {
        !          1065:                        int entry = np->dirty_tx % TX_RING_SIZE;
        !          1066:                        if ( ! (np->tx_ring[entry].status & cpu_to_le32(DescTxDMADone)))
        !          1067:                                break;
        !          1068:                        /* Free the original skb. */
        !          1069:                        dev_free_skb_irq(np->tx_skbuff[entry]);
        !          1070:                        np->tx_skbuff[entry] = 0;
        !          1071:                }
        !          1072:                if (np->tx_full  &&  np->cur_tx - np->dirty_tx < TX_QUEUE_LEN - 4) {
        !          1073:                        /* The ring is no longer full, allow new TX entries. */
        !          1074:                        np->tx_full = 0;
        !          1075:                        netif_resume_tx_queue(dev);
        !          1076:                }
        !          1077: 
        !          1078:                /* Abnormal error summary/uncommon events handlers. */
        !          1079:                if (intr_status & (IntrDrvRqst | IntrPCIErr | LinkChange | StatsMax))
        !          1080:                        netdev_error(dev, intr_status);
        !          1081: 
        !          1082:                if (--boguscnt < 0) {
        !          1083:                        int intr_clear = readw(ioaddr + IntrClear);
        !          1084:                        get_stats(dev);
        !          1085:                        printk(KERN_WARNING "%s: Too much work at interrupt, "
        !          1086:                                   "status=0x%4.4x / 0x%4.4x .. 0x%4.4x.\n",
        !          1087:                                   dev->name, intr_status, intr_clear,
        !          1088:                                   (int)readw(ioaddr + IntrClear));
        !          1089:                        /* Re-enable us in 3.2msec. */
        !          1090:                        writew(1000, ioaddr + DownCounter);
        !          1091:                        writew(IntrDrvRqst, ioaddr + IntrEnable);
        !          1092:                        break;
        !          1093:                }
        !          1094:        } while (1);
        !          1095: 
        !          1096:        if (np->msg_level & NETIF_MSG_INTR)
        !          1097:                printk(KERN_DEBUG "%s: exiting interrupt, status=%#4.4x.\n",
        !          1098:                           dev->name, (int)readw(ioaddr + IntrStatus));
        !          1099: 
        !          1100:        return;
        !          1101: }
        !          1102: 
        !          1103: /* This routine is logically part of the interrupt handler, but separated
        !          1104:    for clarity and better register allocation. */
        !          1105: static int netdev_rx(struct net_device *dev)
        !          1106: {
        !          1107:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1108:        int entry = np->cur_rx % RX_RING_SIZE;
        !          1109:        int boguscnt = np->dirty_rx + RX_RING_SIZE - np->cur_rx;
        !          1110: 
        !          1111:        if (np->msg_level & NETIF_MSG_RX_STATUS) {
        !          1112:                printk(KERN_DEBUG " In netdev_rx(), entry %d status %4.4x.\n",
        !          1113:                           entry, np->rx_ring[entry].status);
        !          1114:        }
        !          1115: 
        !          1116:        /* If EOP is set on the next entry, it's a new packet. Send it up. */
        !          1117:        while (np->rx_head_desc->status & cpu_to_le32(DescOwn)) {
        !          1118:                struct netdev_desc *desc = np->rx_head_desc;
        !          1119:                u32 frame_status = le32_to_cpu(desc->status);
        !          1120:                int pkt_len = frame_status & 0x1fff;            /* Chip omits the CRC. */
        !          1121: 
        !          1122:                if (np->msg_level & NETIF_MSG_RX_STATUS)
        !          1123:                        printk(KERN_DEBUG "  netdev_rx() status was %8.8x.\n",
        !          1124:                                   frame_status);
        !          1125:                if (--boguscnt < 0)
        !          1126:                        break;
        !          1127:                if (frame_status & 0x001f4000) {
        !          1128:                        /* There was a error. */
        !          1129:                        if (np->msg_level & NETIF_MSG_RX_ERR)
        !          1130:                                printk(KERN_DEBUG "  netdev_rx() Rx error was %8.8x.\n",
        !          1131:                                           frame_status);
        !          1132:                        np->stats.rx_errors++;
        !          1133:                        if (frame_status & 0x00100000) np->stats.rx_length_errors++;
        !          1134:                        if (frame_status & 0x00010000) np->stats.rx_fifo_errors++;
        !          1135:                        if (frame_status & 0x00060000) np->stats.rx_frame_errors++;
        !          1136:                        if (frame_status & 0x00080000) np->stats.rx_crc_errors++;
        !          1137:                        if (frame_status & 0x00100000) {
        !          1138:                                printk(KERN_WARNING "%s: Oversized Ethernet frame,"
        !          1139:                                           " status %8.8x.\n",
        !          1140:                                           dev->name, frame_status);
        !          1141:                        }
        !          1142:                } else {
        !          1143:                        struct sk_buff *skb;
        !          1144: 
        !          1145: #ifndef final_version
        !          1146:                        if (np->msg_level & NETIF_MSG_RX_STATUS)
        !          1147:                                printk(KERN_DEBUG "  netdev_rx() normal Rx pkt length %d"
        !          1148:                                           ", bogus_cnt %d.\n",
        !          1149:                                           pkt_len, boguscnt);
        !          1150: #endif
        !          1151:                        /* Check if the packet is long enough to accept without copying
        !          1152:                           to a minimally-sized skbuff. */
        !          1153:                        if (pkt_len < np->rx_copybreak
        !          1154:                                && (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
        !          1155:                                skb->dev = dev;
        !          1156:                                skb_reserve(skb, 2);    /* 16 byte align the IP header */
        !          1157:                                eth_copy_and_sum(skb, np->rx_skbuff[entry]->tail, pkt_len, 0);
        !          1158:                                skb_put(skb, pkt_len);
        !          1159:                        } else {
        !          1160:                                skb_put(skb = np->rx_skbuff[entry], pkt_len);
        !          1161:                                np->rx_skbuff[entry] = NULL;
        !          1162:                        }
        !          1163:                        skb->protocol = eth_type_trans(skb, dev);
        !          1164:                        /* Note: checksum -> skb->ip_summed = CHECKSUM_UNNECESSARY; */
        !          1165:                        netif_rx(skb);
        !          1166:                        dev->last_rx = jiffies;
        !          1167:                }
        !          1168:                entry = (++np->cur_rx) % RX_RING_SIZE;
        !          1169:                np->rx_head_desc = &np->rx_ring[entry];
        !          1170:        }
        !          1171: 
        !          1172:        /* Refill the Rx ring buffers. */
        !          1173:        for (; np->cur_rx - np->dirty_rx > 0; np->dirty_rx++) {
        !          1174:                struct sk_buff *skb;
        !          1175:                entry = np->dirty_rx % RX_RING_SIZE;
        !          1176:                if (np->rx_skbuff[entry] == NULL) {
        !          1177:                        skb = dev_alloc_skb(np->rx_buf_sz);
        !          1178:                        np->rx_skbuff[entry] = skb;
        !          1179:                        if (skb == NULL)
        !          1180:                                break;                          /* Better luck next round. */
        !          1181:                        skb->dev = dev;                 /* Mark as being used by this device. */
        !          1182:                        skb_reserve(skb, 2);    /* Align IP on 16 byte boundaries */
        !          1183:                        np->rx_ring[entry].frag[0].addr = virt_to_le32desc(skb->tail);
        !          1184:                }
        !          1185:                /* Perhaps we need not reset this field. */
        !          1186:                np->rx_ring[entry].frag[0].length =
        !          1187:                        cpu_to_le32(np->rx_buf_sz | LastFrag);
        !          1188:                np->rx_ring[entry].status = 0;
        !          1189:        }
        !          1190: 
        !          1191:        /* No need to restart Rx engine, it will poll. */
        !          1192:        return 0;
        !          1193: }
        !          1194: 
        !          1195: static void netdev_error(struct net_device *dev, int intr_status)
        !          1196: {
        !          1197:        long ioaddr = dev->base_addr;
        !          1198:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1199: 
        !          1200:        if (intr_status & IntrDrvRqst) {
        !          1201:                /* Stop the down counter and turn interrupts back on. */
        !          1202:                printk(KERN_WARNING "%s: Turning interrupts back on.\n", dev->name);
        !          1203:                writew(0, ioaddr + DownCounter);
        !          1204:                writew(IntrRxDMADone | IntrPCIErr | IntrDrvRqst |
        !          1205:                           IntrTxDone | StatsMax | LinkChange, ioaddr + IntrEnable);
        !          1206:        }
        !          1207:        if (intr_status & LinkChange) {
        !          1208:                int new_status = readb(ioaddr + MIICtrl) & 0xE0;
        !          1209:                if (np->msg_level & NETIF_MSG_LINK)
        !          1210:                        printk(KERN_NOTICE "%s: Link changed: Autonegotiation advertising"
        !          1211:                                   " %4.4x  partner %4.4x.\n", dev->name,
        !          1212:                                   mdio_read(dev, np->phys[0], 4),
        !          1213:                                   mdio_read(dev, np->phys[0], 5));
        !          1214:                if ((np->link_status ^ new_status) & 0x80) {
        !          1215:                        if (new_status & 0x80)
        !          1216:                                netif_link_up(dev);
        !          1217:                        else
        !          1218:                                netif_link_down(dev);
        !          1219:                }
        !          1220:                np->link_status = new_status;
        !          1221:                check_duplex(dev);
        !          1222:        }
        !          1223:        if (intr_status & StatsMax) {
        !          1224:                get_stats(dev);
        !          1225:        }
        !          1226:        if (intr_status & IntrPCIErr) {
        !          1227:                printk(KERN_ERR "%s: Something Wicked happened! %4.4x.\n",
        !          1228:                           dev->name, intr_status);
        !          1229:                /* We must do a global reset of DMA to continue. */
        !          1230:        }
        !          1231: }
        !          1232: 
        !          1233: static struct net_device_stats *get_stats(struct net_device *dev)
        !          1234: {
        !          1235:        long ioaddr = dev->base_addr;
        !          1236:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1237:        int i;
        !          1238: 
        !          1239:        if (readw(ioaddr + StationAddr) == 0xffff)
        !          1240:                return &np->stats;
        !          1241: 
        !          1242:        /* We do not spinlock statistics.
        !          1243:           A window only exists if we have non-atomic adds, the error counts
        !          1244:           are typically zero, and statistics are non-critical. */ 
        !          1245:        np->stats.rx_missed_errors      += readb(ioaddr + RxMissed);
        !          1246:        np->stats.tx_packets += readw(ioaddr + TxFramesOK);
        !          1247:        np->stats.rx_packets += readw(ioaddr + RxFramesOK);
        !          1248:        np->stats.collisions += readb(ioaddr + StatsLateColl);
        !          1249:        np->stats.collisions += readb(ioaddr + StatsMultiColl);
        !          1250:        np->stats.collisions += readb(ioaddr + StatsOneColl);
        !          1251:        readb(ioaddr + StatsCarrierError);
        !          1252:        readb(ioaddr + StatsTxDefer);
        !          1253:        for (i = StatsTxXSDefer; i <= StatsMcastRx; i++)
        !          1254:                readb(ioaddr + i);
        !          1255: #if LINUX_VERSION_CODE > 0x20127
        !          1256:        np->stats.tx_bytes += readw(ioaddr + TxOctetsLow);
        !          1257:        np->stats.tx_bytes += readw(ioaddr + TxOctetsHigh) << 16;
        !          1258:        np->stats.rx_bytes += readw(ioaddr + RxOctetsLow);
        !          1259:        np->stats.rx_bytes += readw(ioaddr + RxOctetsHigh) << 16;
        !          1260: #else
        !          1261:        readw(ioaddr + TxOctetsLow);
        !          1262:        readw(ioaddr + TxOctetsHigh);
        !          1263:        readw(ioaddr + RxOctetsLow);
        !          1264:        readw(ioaddr + RxOctetsHigh);
        !          1265: #endif
        !          1266: 
        !          1267:        return &np->stats;
        !          1268: }
        !          1269: 
        !          1270: /* The little-endian AUTODIN II ethernet CRC calculations.
        !          1271:    A big-endian version is also available.
        !          1272:    This is slow but compact code.  Do not use this routine for bulk data,
        !          1273:    use a table-based routine instead.
        !          1274:    This is common code and should be moved to net/core/crc.c.
        !          1275:    Chips may use the upper or lower CRC bits, and may reverse and/or invert
        !          1276:    them.  Select the endian-ness that results in minimal calculations.
        !          1277: */
        !          1278: static unsigned const ethernet_polynomial_le = 0xedb88320U;
        !          1279: static inline unsigned ether_crc_le(int length, unsigned char *data)
        !          1280: {
        !          1281:        unsigned int crc = ~0;  /* Initial value. */
        !          1282:        while(--length >= 0) {
        !          1283:                unsigned char current_octet = *data++;
        !          1284:                int bit;
        !          1285:                for (bit = 8; --bit >= 0; current_octet >>= 1) {
        !          1286:                        if ((crc ^ current_octet) & 1) {
        !          1287:                                crc >>= 1;
        !          1288:                                crc ^= ethernet_polynomial_le;
        !          1289:                        } else
        !          1290:                                crc >>= 1;
        !          1291:                }
        !          1292:        }
        !          1293:        return crc;
        !          1294: }
        !          1295: 
        !          1296: static void set_rx_mode(struct net_device *dev)
        !          1297: {
        !          1298:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1299:        long ioaddr = dev->base_addr;
        !          1300:        u16 mc_filter[4];                       /* Multicast hash filter */
        !          1301:        u32 rx_mode;
        !          1302:        int i;
        !          1303: 
        !          1304:        if (dev->flags & IFF_PROMISC) {                 /* Set promiscuous. */
        !          1305:                /* Unconditionally log net taps. */
        !          1306:                printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
        !          1307:                memset(mc_filter, ~0, sizeof(mc_filter));
        !          1308:                rx_mode = AcceptBroadcast | AcceptMulticast | AcceptAll | AcceptMyPhys;
        !          1309:        } else if ((dev->mc_count > np->multicast_filter_limit)
        !          1310:                           ||  (dev->flags & IFF_ALLMULTI)) {
        !          1311:                /* Too many to match, or accept all multicasts. */
        !          1312:                memset(mc_filter, 0xff, sizeof(mc_filter));
        !          1313:                rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
        !          1314:        } else if (dev->mc_count) {
        !          1315:                struct dev_mc_list *mclist;
        !          1316:                memset(mc_filter, 0, sizeof(mc_filter));
        !          1317:                for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
        !          1318:                         i++, mclist = mclist->next) {
        !          1319:                        set_bit(ether_crc_le(ETH_ALEN, mclist->dmi_addr) & 0x3f,
        !          1320:                                        mc_filter);
        !          1321:                }
        !          1322:                rx_mode = AcceptBroadcast | AcceptMultiHash | AcceptMyPhys;
        !          1323:        } else {
        !          1324:                writeb(AcceptBroadcast | AcceptMyPhys, ioaddr + RxMode);
        !          1325:                return;
        !          1326:        }
        !          1327:        for (i = 0; i < 4; i++)
        !          1328:                writew(mc_filter[i], ioaddr + MulticastFilter0 + i*2);
        !          1329:        writeb(rx_mode, ioaddr + RxMode);
        !          1330: }
        !          1331: 
        !          1332: static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
        !          1333: {
        !          1334:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1335:        u16 *data = (u16 *)&rq->ifr_data;
        !          1336:        u32 *data32 = (void *)&rq->ifr_data;
        !          1337: 
        !          1338:        switch(cmd) {
        !          1339:        case 0x8947: case 0x89F0:
        !          1340:                /* SIOCGMIIPHY: Get the address of the PHY in use. */
        !          1341:                data[0] = np->phys[0] & 0x1f;
        !          1342:                /* Fall Through */
        !          1343:        case 0x8948: case 0x89F1:
        !          1344:                /* SIOCGMIIREG: Read the specified MII register. */
        !          1345:                data[3] = mdio_read(dev, data[0] & 0x1f, data[1] & 0x1f);
        !          1346:                return 0;
        !          1347:        case 0x8949: case 0x89F2:
        !          1348:                /* SIOCSMIIREG: Write the specified MII register */
        !          1349:                if (!capable(CAP_NET_ADMIN))
        !          1350:                        return -EPERM;
        !          1351:                if (data[0] == np->phys[0]) {
        !          1352:                        u16 value = data[2];
        !          1353:                        switch (data[1]) {
        !          1354:                        case 0:
        !          1355:                                /* Check for autonegotiation on or reset. */
        !          1356:                                np->medialock = (value & 0x9000) ? 0 : 1;
        !          1357:                                if (np->medialock)
        !          1358:                                        np->full_duplex = (value & 0x0100) ? 1 : 0;
        !          1359:                                break;
        !          1360:                        case 4: np->advertising = value; break;
        !          1361:                        }
        !          1362:                        /* Perhaps check_duplex(dev), depending on chip semantics. */
        !          1363:                }
        !          1364:                mdio_write(dev, data[0] & 0x1f, data[1] & 0x1f, data[2]);
        !          1365:                return 0;
        !          1366:        case SIOCGPARAMS:
        !          1367:                data32[0] = np->msg_level;
        !          1368:                data32[1] = np->multicast_filter_limit;
        !          1369:                data32[2] = np->max_interrupt_work;
        !          1370:                data32[3] = np->rx_copybreak;
        !          1371:                return 0;
        !          1372:        case SIOCSPARAMS:
        !          1373:                if (!capable(CAP_NET_ADMIN))
        !          1374:                        return -EPERM;
        !          1375:                np->msg_level = data32[0];
        !          1376:                np->multicast_filter_limit = data32[1];
        !          1377:                np->max_interrupt_work = data32[2];
        !          1378:                np->rx_copybreak = data32[3];
        !          1379:                return 0;
        !          1380:        default:
        !          1381:                return -EOPNOTSUPP;
        !          1382:        }
        !          1383: }
        !          1384: 
        !          1385: static int sundance_pwr_event(void *dev_instance, int event)
        !          1386: {
        !          1387:        struct net_device *dev = dev_instance;
        !          1388:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1389:        long ioaddr = dev->base_addr;
        !          1390: 
        !          1391:        if (np->msg_level & NETIF_MSG_LINK)
        !          1392:                printk(KERN_DEBUG "%s: Handling power event %d.\n", dev->name, event);
        !          1393:        switch(event) {
        !          1394:        case DRV_ATTACH:
        !          1395:                MOD_INC_USE_COUNT;
        !          1396:                break;
        !          1397:        case DRV_SUSPEND:
        !          1398:                /* Disable interrupts, stop Tx and Rx. */
        !          1399:                writew(0x0000, ioaddr + IntrEnable);
        !          1400:                writew(TxDisable | RxDisable | StatsDisable, ioaddr + MACCtrl1);
        !          1401:                break;
        !          1402:        case DRV_RESUME:
        !          1403:                sundance_start(dev);
        !          1404:                break;
        !          1405:        case DRV_DETACH: {
        !          1406:                struct net_device **devp, **next;
        !          1407:                if (dev->flags & IFF_UP) {
        !          1408:                        /* Some, but not all, kernel versions close automatically. */
        !          1409:                        dev_close(dev);
        !          1410:                        dev->flags &= ~(IFF_UP|IFF_RUNNING);
        !          1411:                }
        !          1412:                unregister_netdev(dev);
        !          1413:                release_region(dev->base_addr, pci_id_tbl[np->chip_id].io_size);
        !          1414: #ifndef USE_IO_OPS
        !          1415:                iounmap((char *)dev->base_addr);
        !          1416: #endif
        !          1417:                for (devp = &root_net_dev; *devp; devp = next) {
        !          1418:                        next = &((struct netdev_private *)(*devp)->priv)->next_module;
        !          1419:                        if (*devp == dev) {
        !          1420:                                *devp = *next;
        !          1421:                                break;
        !          1422:                        }
        !          1423:                }
        !          1424:                if (np->priv_addr)
        !          1425:                        kfree(np->priv_addr);
        !          1426:                kfree(dev);
        !          1427:                MOD_DEC_USE_COUNT;
        !          1428:                break;
        !          1429:        }
        !          1430:        case DRV_PWR_WakeOn:
        !          1431:                writeb(readb(ioaddr + WakeEvent) | 2, ioaddr + WakeEvent);
        !          1432:                /* Fall through. */
        !          1433:        case DRV_PWR_DOWN:
        !          1434:        case DRV_PWR_UP:
        !          1435:                acpi_set_pwr_state(np->pci_dev, event==DRV_PWR_UP ? ACPI_D0:ACPI_D3);
        !          1436:                break;
        !          1437:        default:
        !          1438:                return -1;
        !          1439:        }
        !          1440: 
        !          1441:        return 0;
        !          1442: }
        !          1443: 
        !          1444: static int netdev_close(struct net_device *dev)
        !          1445: {
        !          1446:        long ioaddr = dev->base_addr;
        !          1447:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1448:        int i;
        !          1449: 
        !          1450:        netif_stop_tx_queue(dev);
        !          1451: 
        !          1452:        if (np->msg_level & NETIF_MSG_IFDOWN) {
        !          1453:                printk(KERN_DEBUG "%s: Shutting down ethercard, status was Tx %2.2x "
        !          1454:                           "Rx %4.4x Int %2.2x.\n",
        !          1455:                           dev->name, (int)readw(ioaddr + TxStatus),
        !          1456:                           (int)readl(ioaddr + RxStatus), (int)readw(ioaddr + IntrStatus));
        !          1457:                printk(KERN_DEBUG "%s: Queue pointers were Tx %d / %d,  Rx %d / %d.\n",
        !          1458:                           dev->name, np->cur_tx, np->dirty_tx, np->cur_rx, np->dirty_rx);
        !          1459:        }
        !          1460: 
        !          1461:        /* Disable interrupts by clearing the interrupt mask. */
        !          1462:        writew(0x0000, ioaddr + IntrEnable);
        !          1463: 
        !          1464:        /* Stop the chip's Tx and Rx processes. */
        !          1465:        writew(TxDisable | RxDisable | StatsDisable, ioaddr + MACCtrl1);
        !          1466: 
        !          1467:        del_timer(&np->timer);
        !          1468: 
        !          1469: #ifdef __i386__
        !          1470:        if (np->msg_level & NETIF_MSG_IFDOWN) {
        !          1471:                printk("\n"KERN_DEBUG"  Tx ring at %8.8x:\n",
        !          1472:                           (int)virt_to_bus(np->tx_ring));
        !          1473:                for (i = 0; i < TX_RING_SIZE; i++)
        !          1474:                        printk(" #%d desc. %4.4x %8.8x %8.8x.\n",
        !          1475:                                   i, np->tx_ring[i].status, np->tx_ring[i].frag[0].addr,
        !          1476:                                   np->tx_ring[i].frag[0].length);
        !          1477:                printk("\n"KERN_DEBUG "  Rx ring %8.8x:\n",
        !          1478:                           (int)virt_to_bus(np->rx_ring));
        !          1479:                for (i = 0; i < /*RX_RING_SIZE*/4 ; i++) {
        !          1480:                        printk(KERN_DEBUG " #%d desc. %4.4x %4.4x %8.8x\n",
        !          1481:                                   i, np->rx_ring[i].status, np->rx_ring[i].frag[0].addr,
        !          1482:                                   np->rx_ring[i].frag[0].length);
        !          1483:                }
        !          1484:        }
        !          1485: #endif /* __i386__ debugging only */
        !          1486: 
        !          1487:        free_irq(dev->irq, dev);
        !          1488: 
        !          1489:        /* Free all the skbuffs in the Rx queue. */
        !          1490:        for (i = 0; i < RX_RING_SIZE; i++) {
        !          1491:                np->rx_ring[i].status = 0;
        !          1492:                np->rx_ring[i].frag[0].addr = 0xBADF00D0; /* An invalid address. */
        !          1493:                if (np->rx_skbuff[i]) {
        !          1494: #if LINUX_VERSION_CODE < 0x20100
        !          1495:                        np->rx_skbuff[i]->free = 1;
        !          1496: #endif
        !          1497:                        dev_free_skb(np->rx_skbuff[i]);
        !          1498:                }
        !          1499:                np->rx_skbuff[i] = 0;
        !          1500:        }
        !          1501:        for (i = 0; i < TX_RING_SIZE; i++) {
        !          1502:                if (np->tx_skbuff[i])
        !          1503:                        dev_free_skb(np->tx_skbuff[i]);
        !          1504:                np->tx_skbuff[i] = 0;
        !          1505:        }
        !          1506: 
        !          1507:        MOD_DEC_USE_COUNT;
        !          1508: 
        !          1509:        return 0;
        !          1510: }
        !          1511: 
        !          1512: 
        !          1513: #ifdef MODULE
        !          1514: int init_module(void)
        !          1515: {
        !          1516:        if (debug >= NETIF_MSG_DRV)     /* Emit version even if no cards detected. */
        !          1517:                printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
        !          1518:        return pci_drv_register(&sundance_drv_id, NULL);
        !          1519: }
        !          1520: 
        !          1521: void cleanup_module(void)
        !          1522: {
        !          1523:        struct net_device *next_dev;
        !          1524: 
        !          1525:        pci_drv_unregister(&sundance_drv_id);
        !          1526: 
        !          1527:        /* No need to check MOD_IN_USE, as sys_delete_module() checks. */
        !          1528:        while (root_net_dev) {
        !          1529:                struct netdev_private *np = (void *)(root_net_dev->priv);
        !          1530:                unregister_netdev(root_net_dev);
        !          1531: #ifdef USE_IO_OPS
        !          1532:                release_region(root_net_dev->base_addr,
        !          1533:                                           pci_id_tbl[np->chip_id].io_size);
        !          1534: #else
        !          1535:                iounmap((char *)root_net_dev->base_addr);
        !          1536: #endif
        !          1537:                next_dev = np->next_module;
        !          1538:                if (np->priv_addr)
        !          1539:                        kfree(np->priv_addr);
        !          1540:                kfree(root_net_dev);
        !          1541:                root_net_dev = next_dev;
        !          1542:        }
        !          1543: }
        !          1544: 
        !          1545: #endif  /* MODULE */
        !          1546: 
        !          1547: /*
        !          1548:  * Local variables:
        !          1549:  *  compile-command: "make KERNVER=`uname -r` sundance.o"
        !          1550:  *  compile-cmd1: "gcc -DMODULE -Wall -Wstrict-prototypes -O6 -c sundance.c"
        !          1551:  *  simple-compile-command: "gcc -DMODULE -O6 -c sundance.c"
        !          1552:  *  c-indent-level: 4
        !          1553:  *  c-basic-offset: 4
        !          1554:  *  tab-width: 4
        !          1555:  * End:
        !          1556:  */

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