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

1.1     ! root        1: /* natsemi.c: A Linux PCI Ethernet driver for the NatSemi DP83810 series. */
        !             2: /*
        !             3:        Written/copyright 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.  License for under other terms may be
        !            11:        available.  Contact the original author for details.
        !            12: 
        !            13:        The original author may be reached as [email protected], or at
        !            14:        Scyld Computing Corporation
        !            15:        914 Bay Ridge Road, Suite 220
        !            16:        Annapolis MD 21403
        !            17: 
        !            18:        Support information and updates available at
        !            19:                http://www.scyld.com/network/natsemi.html
        !            20:        The information and support mailing lists are based at
        !            21:                http://www.scyld.com/mailman/listinfo/
        !            22: */
        !            23: 
        !            24: /* These identify the driver base version and may not be removed. */
        !            25: static const char version1[] =
        !            26: "natsemi.c:v1.17a 8/09/2003  Written by Donald Becker <[email protected]>\n";
        !            27: static const char version2[] =
        !            28: "  http://www.scyld.com/network/natsemi.html\n";
        !            29: /* Updated to recommendations in pci-skeleton v2.11. */
        !            30: 
        !            31: /* Automatically extracted configuration info:
        !            32: probe-func: natsemi_probe
        !            33: config-in: tristate 'National Semiconductor DP8381x series PCI Ethernet support' CONFIG_NATSEMI
        !            34: 
        !            35: c-help-name: National Semiconductor DP8381x series PCI Ethernet support
        !            36: c-help-symbol: CONFIG_NATSEMI
        !            37: c-help: This driver is for the National Semiconductor DP83810 series,
        !            38: c-help: including the 83815 chip.
        !            39: c-help: Usage information and updates are available from
        !            40: c-help: http://www.scyld.com/network/natsemi.html
        !            41: */
        !            42: 
        !            43: /* The user-configurable values.
        !            44:    These may be modified when a driver module is loaded.*/
        !            45: 
        !            46: /* Message enable level: 0..31 = no..all messages.  See NETIF_MSG docs. */
        !            47: static int debug = 2;
        !            48: 
        !            49: /* Maximum events (Rx packets, etc.) to handle at each interrupt. */
        !            50: static int max_interrupt_work = 20;
        !            51: 
        !            52: /* Maximum number of multicast addresses to filter (vs. rx-all-multicast).
        !            53:    This chip uses a 512 element hash table based on the Ethernet CRC.
        !            54:    Some chip versions are reported to have unreliable multicast filter
        !            55:    circuitry.  To work around an observed problem set this value to '0',
        !            56:    which will immediately switch to Rx-all-multicast.
        !            57: */
        !            58: static int multicast_filter_limit = 100;
        !            59: 
        !            60: /* Set the copy breakpoint for the copy-only-tiny-frames scheme.
        !            61:    Setting to > 1518 effectively disables this feature.
        !            62:    This chip can only receive into aligned buffers, so architectures such
        !            63:    as the Alpha AXP might benefit from a copy-align.
        !            64: */
        !            65: static int rx_copybreak = 0;
        !            66: 
        !            67: /* Used to pass the media type, etc.
        !            68:    Both 'options[]' and 'full_duplex[]' should exist for driver
        !            69:    interoperability, however setting full_duplex[] is deprecated.
        !            70:    The media type is usually passed in 'options[]'.
        !            71:        The default is autonegotation for speed and duplex.
        !            72:        This should rarely be overridden.
        !            73:        Use option values 0x10/0x20 for 10Mbps, 0x100,0x200 for 100Mbps.
        !            74:        Use option values 0x10 and 0x100 for forcing half duplex fixed speed.
        !            75:        Use option values 0x20 and 0x200 for forcing full duplex operation.
        !            76: */
        !            77: #define MAX_UNITS 8            /* More are supported, limit only on options */
        !            78: static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
        !            79: static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
        !            80: 
        !            81: /* Operational parameters that are set at compile time. */
        !            82: 
        !            83: /* Keep the ring sizes a power of two for compile efficiency.
        !            84:    Understand the implications before changing these settings!
        !            85:    The compiler will convert <unsigned>'%'<2^N> into a bit mask.
        !            86:    Making the Tx ring too large decreases the effectiveness of channel
        !            87:    bonding and packet priority.
        !            88:    Too-large receive rings waste memory and confound network buffer limits. */
        !            89: #define TX_RING_SIZE   16
        !            90: #define TX_QUEUE_LEN   10              /* Limit ring entries actually used, min 4. */
        !            91: #define RX_RING_SIZE   32
        !            92: 
        !            93: /* Operational parameters that usually are not changed. */
        !            94: /* Time in jiffies before concluding the transmitter is hung.
        !            95:    Re-autonegotiation may take up to 3 seconds.
        !            96:  */
        !            97: #define TX_TIMEOUT  (6*HZ)
        !            98: 
        !            99: /* Allocation size of Rx buffers with normal sized Ethernet frames.
        !           100:    Do not change this value without good reason.  This is not a limit,
        !           101:    but a way to keep a consistent allocation size among drivers.
        !           102:  */
        !           103: #define PKT_BUF_SZ             1536
        !           104: 
        !           105: #ifndef __KERNEL__
        !           106: #define __KERNEL__
        !           107: #endif
        !           108: #if !defined(__OPTIMIZE__)
        !           109: #warning  You must compile this file with the correct options!
        !           110: #warning  See the last lines of the source file.
        !           111: #error You must compile this driver with "-O".
        !           112: #endif
        !           113: 
        !           114: /* Include files, designed to support most kernel versions 2.0.0 and later. */
        !           115: #include <linux/config.h>
        !           116: #if defined(CONFIG_SMP) && ! defined(__SMP__)
        !           117: #define __SMP__
        !           118: #endif
        !           119: #if defined(MODULE) && defined(CONFIG_MODVERSIONS) && ! defined(MODVERSIONS)
        !           120: #define MODVERSIONS
        !           121: #endif
        !           122: 
        !           123: #include <linux/version.h>
        !           124: #if defined(MODVERSIONS)
        !           125: #include <linux/modversions.h>
        !           126: #endif
        !           127: #include <linux/module.h>
        !           128: 
        !           129: #include <linux/kernel.h>
        !           130: #include <linux/string.h>
        !           131: #include <linux/timer.h>
        !           132: #include <linux/errno.h>
        !           133: #include <linux/ioport.h>
        !           134: #if LINUX_VERSION_CODE >= 0x20400
        !           135: #include <linux/slab.h>
        !           136: #else
        !           137: #include <linux/malloc.h>
        !           138: #endif
        !           139: #include <linux/interrupt.h>
        !           140: #include <linux/pci.h>
        !           141: #include <linux/netdevice.h>
        !           142: #include <linux/etherdevice.h>
        !           143: #include <linux/skbuff.h>
        !           144: #include <asm/processor.h>             /* Processor type for cache alignment. */
        !           145: #include <asm/bitops.h>
        !           146: #include <asm/io.h>
        !           147: 
        !           148: #ifdef INLINE_PCISCAN
        !           149: #include "k_compat.h"
        !           150: #else
        !           151: #include "pci-scan.h"
        !           152: #include "kern_compat.h"
        !           153: #endif
        !           154: 
        !           155: /* Condensed operations for readability. */
        !           156: #define virt_to_le32desc(addr)  cpu_to_le32(virt_to_bus(addr))
        !           157: #define le32desc_to_virt(addr)  bus_to_virt(le32_to_cpu(addr))
        !           158: 
        !           159: #if (LINUX_VERSION_CODE >= 0x20100)  &&  defined(MODULE)
        !           160: char kernel_version[] = UTS_RELEASE;
        !           161: #endif
        !           162: 
        !           163: MODULE_AUTHOR("Donald Becker <[email protected]>");
        !           164: MODULE_DESCRIPTION("National Semiconductor DP83810 series PCI Ethernet driver");
        !           165: MODULE_LICENSE("GPL");
        !           166: MODULE_PARM(debug, "i");
        !           167: MODULE_PARM(options, "1-" __MODULE_STRING(MAX_UNITS) "i");
        !           168: MODULE_PARM(rx_copybreak, "i");
        !           169: MODULE_PARM(full_duplex, "1-" __MODULE_STRING(MAX_UNITS) "i");
        !           170: MODULE_PARM(multicast_filter_limit, "i");
        !           171: MODULE_PARM(max_interrupt_work, "i");
        !           172: MODULE_PARM_DESC(debug, "Driver message level (0-31)");
        !           173: MODULE_PARM_DESC(options, "Force transceiver type or fixed speed+duplex");
        !           174: MODULE_PARM_DESC(max_interrupt_work,
        !           175:                                 "Driver maximum events handled per interrupt");
        !           176: MODULE_PARM_DESC(full_duplex,
        !           177:                                 "Non-zero to force full duplex, non-negotiated link "
        !           178:                                 "(deprecated).");
        !           179: MODULE_PARM_DESC(rx_copybreak,
        !           180:                                 "Breakpoint in bytes for copy-only-tiny-frames");
        !           181: MODULE_PARM_DESC(multicast_filter_limit,
        !           182:                                 "Multicast addresses before switching to Rx-all-multicast");
        !           183: 
        !           184: /*
        !           185:                                Theory of Operation
        !           186: 
        !           187: I. Board Compatibility
        !           188: 
        !           189: This driver is designed for National Semiconductor DP83815 PCI Ethernet NIC.
        !           190: It also works with other chips in in the DP83810 series.
        !           191: The most common board is the Netgear FA311 using the 83815.
        !           192: 
        !           193: II. Board-specific settings
        !           194: 
        !           195: This driver requires the PCI interrupt line to be valid.
        !           196: It honors the EEPROM-set values.
        !           197: 
        !           198: III. Driver operation
        !           199: 
        !           200: IIIa. Ring buffers
        !           201: 
        !           202: This driver uses two statically allocated fixed-size descriptor lists
        !           203: formed into rings by a branch from the final descriptor to the beginning of
        !           204: the list.  The ring sizes are set at compile time by RX/TX_RING_SIZE.
        !           205: The NatSemi design uses a 'next descriptor' pointer that the driver forms
        !           206: into a list, thus rings can be arbitrarily sized.  Before changing the
        !           207: ring sizes you should understand the flow and cache effects of the
        !           208: full/available/empty hysteresis.
        !           209: 
        !           210: IIIb/c. Transmit/Receive Structure
        !           211: 
        !           212: This driver uses a zero-copy receive and transmit scheme.
        !           213: The driver allocates full frame size skbuffs for the Rx ring buffers at
        !           214: open() time and passes the skb->data field to the chip as receive data
        !           215: buffers.  When an incoming frame is less than RX_COPYBREAK bytes long,
        !           216: a fresh skbuff is allocated and the frame is copied to the new skbuff.
        !           217: When the incoming frame is larger, the skbuff is passed directly up the
        !           218: protocol stack.  Buffers consumed this way are replaced by newly allocated
        !           219: skbuffs in a later phase of receives.
        !           220: 
        !           221: The RX_COPYBREAK value is chosen to trade-off the memory wasted by
        !           222: using a full-sized skbuff for small frames vs. the copying costs of larger
        !           223: frames.  New boards are typically used in generously configured machines
        !           224: and the underfilled buffers have negligible impact compared to the benefit of
        !           225: a single allocation size, so the default value of zero results in never
        !           226: copying packets.  When copying is done, the cost is usually mitigated by using
        !           227: a combined copy/checksum routine.  Copying also preloads the cache, which is
        !           228: most useful with small frames.
        !           229: 
        !           230: A subtle aspect of the operation is that unaligned buffers are not permitted
        !           231: by the hardware.  Thus the IP header at offset 14 in an ethernet frame isn't
        !           232: longword aligned for further processing.  On copies frames are put into the
        !           233: skbuff at an offset of "+2", 16-byte aligning the IP header.
        !           234: 
        !           235: IIId. Synchronization
        !           236: 
        !           237: The driver runs as two independent, single-threaded flows of control.  One
        !           238: is the send-packet routine, which enforces single-threaded use by the
        !           239: dev->tbusy flag.  The other thread is the interrupt handler, which is single
        !           240: threaded by the hardware and interrupt handling software.
        !           241: 
        !           242: The send packet thread has partial control over the Tx ring and 'dev->tbusy'
        !           243: flag.  It sets the tbusy flag whenever it's queuing a Tx packet. If the next
        !           244: queue slot is empty, it clears the tbusy flag when finished otherwise it sets
        !           245: the 'lp->tx_full' flag.
        !           246: 
        !           247: The interrupt handler has exclusive control over the Rx ring and records stats
        !           248: from the Tx ring.  After reaping the stats, it marks the Tx queue entry as
        !           249: empty by incrementing the dirty_tx mark. Iff the 'lp->tx_full' flag is set, it
        !           250: clears both the tx_full and tbusy flags.
        !           251: 
        !           252: IV. Notes
        !           253: 
        !           254: The older dp83810 chips are so uncommon that support is not relevant.
        !           255: No NatSemi datasheet was publically available at the initial release date,
        !           256: but the dp83815 has now been published.
        !           257: 
        !           258: IVb. References
        !           259: 
        !           260: http://www.scyld.com/expert/100mbps.html
        !           261: http://www.scyld.com/expert/NWay.html
        !           262: 
        !           263: 
        !           264: IVc. Errata
        !           265: 
        !           266: Qustionable multicast filter implementation.
        !           267: The EEPROM format is obviously the result of a chip bug.
        !           268: */
        !           269: 
        !           270: 
        !           271: 
        !           272: static void *natsemi_probe1(struct pci_dev *pdev, void *init_dev,
        !           273:                                                        long ioaddr, int irq, int chip_idx, int find_cnt);
        !           274: static int power_event(void *dev_instance, int event);
        !           275: #ifdef USE_IO_OPS
        !           276: #define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_IO  | PCI_ADDR0)
        !           277: #else
        !           278: #define PCI_IOTYPE (PCI_USES_MASTER | PCI_USES_MEM | PCI_ADDR1)
        !           279: #endif
        !           280: 
        !           281: static struct pci_id_info pci_id_tbl[] = {
        !           282:        {"Netgear FA311 (NatSemi DP83815)",
        !           283:         { 0x0020100B, 0xffffffff, 0xf3111385, 0xffffffff, },
        !           284:         PCI_IOTYPE, 256, 0},
        !           285:        {"NatSemi DP83815", { 0x0020100B, 0xffffffff },
        !           286:         PCI_IOTYPE, 256, 0},
        !           287:        {0,},                                           /* 0 terminated list. */
        !           288: };
        !           289: 
        !           290: struct drv_id_info natsemi_drv_id = {
        !           291:        "natsemi", PCI_HOTSWAP, PCI_CLASS_NETWORK_ETHERNET<<8, pci_id_tbl,
        !           292:        natsemi_probe1, power_event };
        !           293: 
        !           294: /* Offsets to the device registers.
        !           295:    Unlike software-only systems, device drivers interact with complex hardware.
        !           296:    It's not useful to define symbolic names for every register bit in the
        !           297:    device.  Please do not change these names without good reason.
        !           298: */
        !           299: enum register_offsets {
        !           300:        ChipCmd=0x00, ChipConfig=0x04, EECtrl=0x08, PCIBusCfg=0x0C,
        !           301:        IntrStatus=0x10, IntrMask=0x14, IntrEnable=0x18,
        !           302:        TxRingPtr=0x20, TxConfig=0x24,
        !           303:        RxRingPtr=0x30, RxConfig=0x34, ClkRunCtrl=0x3C,
        !           304:        WOLCmd=0x40, PauseCmd=0x44, RxFilterAddr=0x48, RxFilterData=0x4C,
        !           305:        BootRomAddr=0x50, BootRomData=0x54, ChipRevReg=0x58,
        !           306:        StatsCtrl=0x5C, StatsData=0x60,
        !           307:        RxPktErrs=0x60, RxMissed=0x68, RxCRCErrs=0x64,
        !           308:        NS_Xcvr_Mgmt = 0x80, NS_MII_BMCR=0x80, NS_MII_BMSR=0x84,
        !           309:        NS_MII_Advert=0x90, NS_MIILinkPartner=0x94,
        !           310: };
        !           311: 
        !           312: /* Bits in ChipCmd. */
        !           313: enum ChipCmdBits {
        !           314:        ChipReset=0x100, SoftIntr=0x80, RxReset=0x20, TxReset=0x10,
        !           315:        RxOff=0x08, RxOn=0x04, TxOff=0x02, TxOn=0x01,
        !           316: };
        !           317: 
        !           318: /* Bits in ChipConfig. */
        !           319: enum ChipConfigBits {
        !           320:        CfgLinkGood=0x80000000, CfgFDX=0x20000000,
        !           321: };
        !           322: 
        !           323: /* Bits in the interrupt status/mask registers. */
        !           324: enum intr_status_bits {
        !           325:        IntrRxDone=0x0001, IntrRxIntr=0x0002, IntrRxErr=0x0004, IntrRxEarly=0x0008,
        !           326:        IntrRxIdle=0x0010, IntrRxOverrun=0x0020,
        !           327:        IntrTxDone=0x0040, IntrTxIntr=0x0080, IntrTxErr=0x0100,
        !           328:        IntrTxIdle=0x0200, IntrTxUnderrun=0x0400,
        !           329:        StatsMax=0x0800, IntrDrv=0x1000, WOLPkt=0x2000, LinkChange=0x4000,
        !           330:        RxStatusOverrun=0x10000,
        !           331:        RxResetDone=0x1000000, TxResetDone=0x2000000,
        !           332:        IntrPCIErr=0x00f00000,
        !           333:        IntrNormalSummary=0x0251, IntrAbnormalSummary=0xED20,
        !           334: };
        !           335: 
        !           336: /* Bits in the RxMode register. */
        !           337: enum rx_mode_bits {
        !           338:        AcceptErr=0x20, AcceptRunt=0x10,
        !           339:        AcceptBroadcast=0xC0000000,
        !           340:        AcceptMulticast=0x00200000, AcceptAllMulticast=0x20000000,
        !           341:        AcceptAllPhys=0x10000000, AcceptMyPhys=0x08000000,
        !           342: };
        !           343: 
        !           344: /* The Rx and Tx buffer descriptors. */
        !           345: /* Note that using only 32 bit fields simplifies conversion to big-endian
        !           346:    architectures. */
        !           347: struct netdev_desc {
        !           348:        u32 next_desc;
        !           349:        s32 cmd_status;
        !           350:        u32 buf_addr;
        !           351:        u32 software_use;
        !           352: };
        !           353: 
        !           354: /* Bits in network_desc.status */
        !           355: enum desc_status_bits {
        !           356:        DescOwn=0x80000000, DescMore=0x40000000, DescIntr=0x20000000,
        !           357:        DescNoCRC=0x10000000,
        !           358:        DescPktOK=0x08000000, RxTooLong=0x00400000,
        !           359: };
        !           360: 
        !           361: #define PRIV_ALIGN     15      /* Required alignment mask */
        !           362: struct netdev_private {
        !           363:        /* Descriptor rings first for alignment. */
        !           364:        struct netdev_desc rx_ring[RX_RING_SIZE];
        !           365:        struct netdev_desc tx_ring[TX_RING_SIZE];
        !           366:        struct net_device *next_module;         /* Link for devices of this type. */
        !           367:        void *priv_addr;                                        /* Unaligned address for kfree */
        !           368:        const char *product_name;
        !           369:        /* The addresses of receive-in-place skbuffs. */
        !           370:        struct sk_buff* rx_skbuff[RX_RING_SIZE];
        !           371:        /* The saved address of a sent-in-place packet/buffer, for later free(). */
        !           372:        struct sk_buff* tx_skbuff[TX_RING_SIZE];
        !           373:        struct net_device_stats stats;
        !           374:        struct timer_list timer;        /* Media monitoring timer. */
        !           375:        /* Frequently used values: keep some adjacent for cache effect. */
        !           376:        int msg_level;
        !           377:        int chip_id, drv_flags;
        !           378:        struct pci_dev *pci_dev;
        !           379:        long in_interrupt;                      /* Word-long for SMP locks. */
        !           380:        int max_interrupt_work;
        !           381:        int intr_enable;
        !           382:        unsigned int restore_intr_enable:1;     /* Set if temporarily masked.  */
        !           383:        unsigned int rx_q_empty:1;                      /* Set out-of-skbuffs.  */
        !           384: 
        !           385:        struct netdev_desc *rx_head_desc;
        !           386:        unsigned int cur_rx, dirty_rx;          /* Producer/consumer ring indices */
        !           387:        unsigned int rx_buf_sz;                         /* Based on MTU+slack. */
        !           388:        int rx_copybreak;
        !           389: 
        !           390:        unsigned int cur_tx, dirty_tx;
        !           391:        unsigned int tx_full:1;                         /* The Tx queue is full. */
        !           392:        /* These values keep track of the transceiver/media in use. */
        !           393:        unsigned int full_duplex:1;                     /* Full-duplex operation requested. */
        !           394:        unsigned int duplex_lock:1;
        !           395:        unsigned int medialock:1;                       /* Do not sense media. */
        !           396:        unsigned int default_port;                      /* Last dev->if_port value. */
        !           397:        /* Rx filter. */
        !           398:        u32 cur_rx_mode;
        !           399:        u16 rx_filter[32];
        !           400:        int multicast_filter_limit;
        !           401:        /* FIFO and PCI burst thresholds. */
        !           402:        int tx_config, rx_config;
        !           403:        /* MII transceiver section. */
        !           404:        u16 advertising;                                        /* NWay media advertisement */
        !           405: };
        !           406: 
        !           407: static int  eeprom_read(long ioaddr, int location);
        !           408: static int  mdio_read(struct net_device *dev, int phy_id, int location);
        !           409: static void mdio_write(struct net_device *dev, int phy_id, int location,
        !           410:                                           int value);
        !           411: static int  netdev_open(struct net_device *dev);
        !           412: static void check_duplex(struct net_device *dev);
        !           413: static void netdev_timer(unsigned long data);
        !           414: static void tx_timeout(struct net_device *dev);
        !           415: static int  rx_ring_fill(struct net_device *dev);
        !           416: static void init_ring(struct net_device *dev);
        !           417: static int  start_tx(struct sk_buff *skb, struct net_device *dev);
        !           418: static void intr_handler(int irq, void *dev_instance, struct pt_regs *regs);
        !           419: static void netdev_error(struct net_device *dev, int intr_status);
        !           420: static int  netdev_rx(struct net_device *dev);
        !           421: static void netdev_error(struct net_device *dev, int intr_status);
        !           422: static void set_rx_mode(struct net_device *dev);
        !           423: static struct net_device_stats *get_stats(struct net_device *dev);
        !           424: static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
        !           425: static int  netdev_close(struct net_device *dev);
        !           426: 
        !           427: 
        !           428: 
        !           429: /* A list of our installed devices, for removing the driver module. */
        !           430: static struct net_device *root_net_dev = NULL;
        !           431: 
        !           432: #ifndef MODULE
        !           433: int natsemi_probe(struct net_device *dev)
        !           434: {
        !           435:        if (pci_drv_register(&natsemi_drv_id, dev) < 0)
        !           436:                return -ENODEV;
        !           437:        printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
        !           438:        return 0;
        !           439: }
        !           440: #endif
        !           441: 
        !           442: static void *natsemi_probe1(struct pci_dev *pdev, void *init_dev,
        !           443:                                                        long ioaddr, int irq, int chip_idx, int card_idx)
        !           444: {
        !           445:        struct net_device *dev;
        !           446:        struct netdev_private *np;
        !           447:        void *priv_mem;
        !           448:        int i, option = card_idx < MAX_UNITS ? options[card_idx] : 0;
        !           449:        int prev_eedata;
        !           450: 
        !           451:        dev = init_etherdev(init_dev, 0);
        !           452:        if (!dev)
        !           453:                return NULL;
        !           454: 
        !           455:        /* Perhaps NETIF_MSG_PROBE */
        !           456:        printk(KERN_INFO "%s: %s at 0x%lx, ",
        !           457:                   dev->name, pci_id_tbl[chip_idx].name, ioaddr);
        !           458: 
        !           459:        /* Work around the dropped serial bit. */
        !           460:        prev_eedata = eeprom_read(ioaddr, 6);
        !           461:        for (i = 0; i < 3; i++) {
        !           462:                int eedata = eeprom_read(ioaddr, i + 7);
        !           463:                dev->dev_addr[i*2] = (eedata << 1) + (prev_eedata >> 15);
        !           464:                dev->dev_addr[i*2+1] = eedata >> 7;
        !           465:                prev_eedata = eedata;
        !           466:        }
        !           467:        for (i = 0; i < 5; i++)
        !           468:                printk("%2.2x:", dev->dev_addr[i]);
        !           469:        printk("%2.2x, IRQ %d.\n", dev->dev_addr[i], irq);
        !           470: 
        !           471:        /* Reset the chip to erase previous misconfiguration. */
        !           472:        writel(ChipReset, ioaddr + ChipCmd);
        !           473: 
        !           474:        /* Make certain elements e.g. descriptor lists are aligned. */
        !           475:        priv_mem = kmalloc(sizeof(*np) + PRIV_ALIGN, GFP_KERNEL);
        !           476:        /* Check for the very unlikely case of no memory. */
        !           477:        if (priv_mem == NULL)
        !           478:                return NULL;
        !           479: 
        !           480:        dev->base_addr = ioaddr;
        !           481:        dev->irq = irq;
        !           482: 
        !           483:        dev->priv = np = (void *)(((long)priv_mem + PRIV_ALIGN) & ~PRIV_ALIGN);
        !           484:        memset(np, 0, sizeof(*np));
        !           485:        np->priv_addr = priv_mem;
        !           486: 
        !           487:        np->next_module = root_net_dev;
        !           488:        root_net_dev = dev;
        !           489: 
        !           490:        np->pci_dev = pdev;
        !           491:        np->chip_id = chip_idx;
        !           492:        np->drv_flags = pci_id_tbl[chip_idx].drv_flags;
        !           493:        np->msg_level = (1 << debug) - 1;
        !           494:        np->rx_copybreak = rx_copybreak;
        !           495:        np->max_interrupt_work = max_interrupt_work;
        !           496:        np->multicast_filter_limit = multicast_filter_limit;
        !           497: 
        !           498:        if (dev->mem_start)
        !           499:                option = dev->mem_start;
        !           500: 
        !           501:        /* 0x10/0x20/0x100/0x200 set forced speed&duplex modes. */
        !           502:        if (option > 0) {
        !           503:                if (option & 0x220)
        !           504:                        np->full_duplex = 1;
        !           505:                np->default_port = option & 0x3ff;
        !           506:                if (np->default_port & 0x330) {
        !           507:                        np->medialock = 1;
        !           508:                        if (np->msg_level & NETIF_MSG_PROBE)
        !           509:                                printk(KERN_INFO "  Forcing %dMbs %s-duplex operation.\n",
        !           510:                                           (option & 0x300 ? 100 : 10),
        !           511:                                           (np->full_duplex ? "full" : "half"));
        !           512:                        writew(((option & 0x300) ? 0x2000 : 0) |        /* 100mbps? */
        !           513:                                   (np->full_duplex ? 0x0100 : 0), /* Full duplex? */
        !           514:                                   ioaddr + NS_MII_BMCR);
        !           515:                }
        !           516:        }
        !           517:        if (card_idx < MAX_UNITS  &&  full_duplex[card_idx] > 0)
        !           518:                np->full_duplex = 1;
        !           519: 
        !           520:        if (np->full_duplex) {
        !           521:                if (np->msg_level & NETIF_MSG_PROBE)
        !           522:                        printk(KERN_INFO "%s: Set to forced full duplex, autonegotiation"
        !           523:                                   " disabled.\n", dev->name);
        !           524:                np->duplex_lock = 1;
        !           525:        }
        !           526: 
        !           527:        /* The chip-specific entries in the device structure. */
        !           528:        dev->open = &netdev_open;
        !           529:        dev->hard_start_xmit = &start_tx;
        !           530:        dev->stop = &netdev_close;
        !           531:        dev->get_stats = &get_stats;
        !           532:        dev->set_multicast_list = &set_rx_mode;
        !           533:        dev->do_ioctl = &mii_ioctl;
        !           534: 
        !           535:        /* Override the PME enable from the EEPROM. */
        !           536:        writel(0x8000, ioaddr + ClkRunCtrl);
        !           537: 
        !           538:        if ((readl(ioaddr + ChipConfig) & 0xe000) != 0xe000) {
        !           539:                u32 chip_config = readl(ioaddr + ChipConfig);
        !           540:                if (np->msg_level & NETIF_MSG_PROBE)
        !           541:                        printk(KERN_INFO "%s: Transceiver default autonegotiation %s "
        !           542:                                   "10%s %s duplex.\n",
        !           543:                                   dev->name, chip_config & 0x2000 ? "enabled, advertise"
        !           544:                                   : "disabled, force", chip_config & 0x4000 ? "0" : "",
        !           545:                                   chip_config & 0x8000 ? "full" : "half");
        !           546:        }
        !           547:        if (np->msg_level & NETIF_MSG_PROBE)
        !           548:                printk(KERN_INFO "%s: Transceiver status 0x%4.4x partner %4.4x.\n",
        !           549:                           dev->name, (int)readl(ioaddr + NS_MII_BMSR),
        !           550:                           (int)readl(ioaddr + NS_MIILinkPartner));
        !           551: 
        !           552:        return dev;
        !           553: }
        !           554: 
        !           555: 
        !           556: /* Read the EEPROM and MII Management Data I/O (MDIO) interfaces.
        !           557:    The EEPROM code is for the common 93c06/46 EEPROMs with 6 bit addresses.
        !           558:    Update to the code in other drivers for 8/10 bit addresses.
        !           559: */
        !           560: 
        !           561: /* Delay between EEPROM clock transitions.
        !           562:    This "delay" forces out buffered PCI writes, which is sufficient to meet
        !           563:    the timing requirements of most EEPROMs.
        !           564: */
        !           565: #define eeprom_delay(ee_addr)  readl(ee_addr)
        !           566: 
        !           567: enum EEPROM_Ctrl_Bits {
        !           568:        EE_ShiftClk=0x04, EE_DataIn=0x01, EE_ChipSelect=0x08, EE_DataOut=0x02,
        !           569: };
        !           570: #define EE_Write0 (EE_ChipSelect)
        !           571: #define EE_Write1 (EE_ChipSelect | EE_DataIn)
        !           572: 
        !           573: /* The EEPROM commands include the preamble. */
        !           574: enum EEPROM_Cmds {
        !           575:        EE_WriteCmd=(5 << 6), EE_ReadCmd=(6 << 6), EE_EraseCmd=(7 << 6),
        !           576: };
        !           577: 
        !           578: static int eeprom_read(long addr, int location)
        !           579: {
        !           580:        int i;
        !           581:        int retval = 0;
        !           582:        long ee_addr = addr + EECtrl;
        !           583:        int read_cmd = location | EE_ReadCmd;
        !           584:        writel(EE_Write0, ee_addr);
        !           585: 
        !           586:        /* Shift the read command bits out. */
        !           587:        for (i = 10; i >= 0; i--) {
        !           588:                short dataval = (read_cmd & (1 << i)) ? EE_Write1 : EE_Write0;
        !           589:                writel(dataval, ee_addr);
        !           590:                eeprom_delay(ee_addr);
        !           591:                writel(dataval | EE_ShiftClk, ee_addr);
        !           592:                eeprom_delay(ee_addr);
        !           593:        }
        !           594:        writel(EE_ChipSelect, ee_addr);
        !           595:        eeprom_delay(ee_addr);
        !           596: 
        !           597:        for (i = 0; i < 16; i++) {
        !           598:                writel(EE_ChipSelect | EE_ShiftClk, ee_addr);
        !           599:                eeprom_delay(ee_addr);
        !           600:                retval |= (readl(ee_addr) & EE_DataOut) ? 1 << i : 0;
        !           601:                writel(EE_ChipSelect, ee_addr);
        !           602:                eeprom_delay(ee_addr);
        !           603:        }
        !           604: 
        !           605:        /* Terminate the EEPROM access. */
        !           606:        writel(EE_Write0, ee_addr);
        !           607:        writel(0, ee_addr);
        !           608:        return retval;
        !           609: }
        !           610: 
        !           611: /*  MII transceiver control section.
        !           612:        The 83815 series has an internal, directly accessable transceiver.
        !           613:        We present the management registers as if they were MII connected. */
        !           614: 
        !           615: static int mdio_read(struct net_device *dev, int phy_id, int location)
        !           616: {
        !           617:        if (phy_id == 1 && location < 32)
        !           618:                return readw(dev->base_addr + NS_Xcvr_Mgmt + (location<<2));
        !           619:        else
        !           620:                return 0xffff;
        !           621: }
        !           622: 
        !           623: static void mdio_write(struct net_device *dev, int phy_id, int location,
        !           624:                                           int value)
        !           625: {
        !           626:        if (phy_id == 1 && location < 32)
        !           627:                writew(value, dev->base_addr + NS_Xcvr_Mgmt + (location<<2));
        !           628: }
        !           629: 
        !           630: 
        !           631: static int netdev_open(struct net_device *dev)
        !           632: {
        !           633:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           634:        long ioaddr = dev->base_addr;
        !           635:        int i;
        !           636: 
        !           637:        /* We do not need to reset the '815 chip. */
        !           638: 
        !           639:        MOD_INC_USE_COUNT;
        !           640: 
        !           641:        if (request_irq(dev->irq, &intr_handler, SA_SHIRQ, dev->name, dev)) {
        !           642:                MOD_DEC_USE_COUNT;
        !           643:                return -EAGAIN;
        !           644:        }
        !           645: 
        !           646:        if (np->msg_level & NETIF_MSG_IFUP)
        !           647:                printk(KERN_DEBUG "%s: netdev_open() irq %d.\n",
        !           648:                           dev->name, dev->irq);
        !           649: 
        !           650:        init_ring(dev);
        !           651: 
        !           652:        writel(virt_to_bus(np->rx_ring), ioaddr + RxRingPtr);
        !           653:        writel(virt_to_bus(np->tx_ring), ioaddr + TxRingPtr);
        !           654: 
        !           655:        for (i = 0; i < 6; i += 2) {
        !           656:                writel(i, ioaddr + RxFilterAddr);
        !           657:                writel(dev->dev_addr[i] + (dev->dev_addr[i+1] << 8),
        !           658:                           ioaddr + RxFilterData);
        !           659:        }
        !           660: 
        !           661:        /* Initialize other registers. */
        !           662:        /* See the datasheet for this correction. */
        !           663:        if (readl(ioaddr + ChipRevReg) == 0x0203) {
        !           664:                writew(0x0001, ioaddr + 0xCC);
        !           665:                writew(0x18C9, ioaddr + 0xE4);
        !           666:                writew(0x0000, ioaddr + 0xFC);
        !           667:                writew(0x5040, ioaddr + 0xF4);
        !           668:                writew(0x008C, ioaddr + 0xF8);
        !           669:        }
        !           670: 
        !           671:        /* Configure the PCI bus bursts and FIFO thresholds. */
        !           672:        /* Configure for standard, in-spec Ethernet. */
        !           673: 
        !           674:        if (readl(ioaddr + ChipConfig) & CfgFDX) {      /* Full duplex */
        !           675:                np->tx_config = 0xD0801002;
        !           676:                np->rx_config = 0x10000020;
        !           677:        } else {
        !           678:                np->tx_config = 0x10801002;
        !           679:                np->rx_config = 0x0020;
        !           680:        }
        !           681:        if (dev->mtu > 1500)
        !           682:                np->rx_config |= 0x08000000;
        !           683:        writel(np->tx_config, ioaddr + TxConfig);
        !           684:        writel(np->rx_config, ioaddr + RxConfig);
        !           685: 
        !           686:        if (dev->if_port == 0)
        !           687:                dev->if_port = np->default_port;
        !           688: 
        !           689:        np->in_interrupt = 0;
        !           690: 
        !           691:        check_duplex(dev);
        !           692:        set_rx_mode(dev);
        !           693:        netif_start_tx_queue(dev);
        !           694: 
        !           695:        /* Enable interrupts by setting the interrupt mask. */
        !           696:        np->intr_enable = IntrNormalSummary | IntrAbnormalSummary | 0x1f;
        !           697:        writel(np->intr_enable, ioaddr + IntrMask);
        !           698:        writel(1, ioaddr + IntrEnable);
        !           699: 
        !           700:        writel(RxOn | TxOn, ioaddr + ChipCmd);
        !           701:        writel(4, ioaddr + StatsCtrl);                                  /* Clear Stats */
        !           702: 
        !           703:        if (np->msg_level & NETIF_MSG_IFUP)
        !           704:                printk(KERN_DEBUG "%s: Done netdev_open(), status: %x.\n",
        !           705:                           dev->name, (int)readl(ioaddr + ChipCmd));
        !           706: 
        !           707:        /* Set the timer to check for link beat. */
        !           708:        init_timer(&np->timer);
        !           709:        np->timer.expires = jiffies + 3*HZ;
        !           710:        np->timer.data = (unsigned long)dev;
        !           711:        np->timer.function = &netdev_timer;                             /* timer handler */
        !           712:        add_timer(&np->timer);
        !           713: 
        !           714:        return 0;
        !           715: }
        !           716: 
        !           717: static void check_duplex(struct net_device *dev)
        !           718: {
        !           719:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           720:        long ioaddr = dev->base_addr;
        !           721:        int duplex;
        !           722: 
        !           723:        if (np->duplex_lock)
        !           724:                return;
        !           725:        duplex = readl(ioaddr + ChipConfig) & 0x20000000 ? 1 : 0;
        !           726:        if (np->full_duplex != duplex) {
        !           727:                np->full_duplex = duplex;
        !           728:                if (np->msg_level & NETIF_MSG_LINK)
        !           729:                        printk(KERN_INFO "%s: Setting %s-duplex based on negotiated link"
        !           730:                                   " capability.\n", dev->name,
        !           731:                                   duplex ? "full" : "half");
        !           732:                if (duplex) {
        !           733:                        np->rx_config |= 0x10000000;
        !           734:                        np->tx_config |= 0xC0000000;
        !           735:                } else {
        !           736:                        np->rx_config &= ~0x10000000;
        !           737:                        np->tx_config &= ~0xC0000000;
        !           738:                }
        !           739:                writel(np->tx_config, ioaddr + TxConfig);
        !           740:                writel(np->rx_config, ioaddr + RxConfig);
        !           741:        }
        !           742: }
        !           743: 
        !           744: static void netdev_timer(unsigned long data)
        !           745: {
        !           746:        struct net_device *dev = (struct net_device *)data;
        !           747:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           748:        long ioaddr = dev->base_addr;
        !           749:        int next_tick = 10*HZ;
        !           750: 
        !           751:        if (np->msg_level & NETIF_MSG_TIMER)
        !           752:                printk(KERN_DEBUG "%s: Driver monitor timer tick, status %8.8x.\n",
        !           753:                           dev->name, (int)readl(ioaddr + IntrStatus));
        !           754:        if (np->rx_q_empty) {
        !           755:                /* Trigger an interrupt to refill. */
        !           756:                writel(SoftIntr, ioaddr + ChipCmd);
        !           757:        }
        !           758:        /* This will either have a small false-trigger window or will not catch
        !           759:           tbusy incorrectly set when the queue is empty. */
        !           760:        if (netif_queue_paused(dev)  &&
        !           761:                np->cur_tx - np->dirty_tx > 1  &&
        !           762:                (jiffies - dev->trans_start) > TX_TIMEOUT) {
        !           763:                tx_timeout(dev);
        !           764:        }
        !           765:        check_duplex(dev);
        !           766:        np->timer.expires = jiffies + next_tick;
        !           767:        add_timer(&np->timer);
        !           768: }
        !           769: 
        !           770: static void tx_timeout(struct net_device *dev)
        !           771: {
        !           772:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           773:        long ioaddr = dev->base_addr;
        !           774: 
        !           775:        printk(KERN_WARNING "%s: Transmit timed out, status %8.8x,"
        !           776:                   " resetting...\n", dev->name, (int)readl(ioaddr + TxRingPtr));
        !           777: 
        !           778:        if (np->msg_level & NETIF_MSG_TX_ERR) {
        !           779:                int i;
        !           780:                printk(KERN_DEBUG "  Rx ring %p: ", np->rx_ring);
        !           781:                for (i = 0; i < RX_RING_SIZE; i++)
        !           782:                        printk(" %8.8x", (unsigned int)np->rx_ring[i].cmd_status);
        !           783:                printk("\n"KERN_DEBUG"  Tx ring %p: ", np->tx_ring);
        !           784:                for (i = 0; i < TX_RING_SIZE; i++)
        !           785:                        printk(" %4.4x", np->tx_ring[i].cmd_status);
        !           786:                printk("\n");
        !           787:        }
        !           788: 
        !           789:        /* Reinitialize the hardware here. */
        !           790:        /* Stop and restart the chip's Tx processes . */
        !           791: 
        !           792:        /* Trigger an immediate transmit demand. */
        !           793: 
        !           794:        dev->trans_start = jiffies;
        !           795:        np->stats.tx_errors++;
        !           796:        return;
        !           797: }
        !           798: 
        !           799: /* Refill the Rx ring buffers, returning non-zero if not full. */
        !           800: static int rx_ring_fill(struct net_device *dev)
        !           801: {
        !           802:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           803:        unsigned int entry;
        !           804: 
        !           805:        for (; np->cur_rx - np->dirty_rx > 0; np->dirty_rx++) {
        !           806:                entry = np->dirty_rx % RX_RING_SIZE;
        !           807:                if (np->rx_skbuff[entry] == NULL) {
        !           808:                        struct sk_buff *skb = dev_alloc_skb(np->rx_buf_sz);
        !           809:                        np->rx_skbuff[entry] = skb;
        !           810:                        if (skb == NULL)
        !           811:                                return 1;                               /* Better luck next time. */
        !           812:                        skb->dev = dev;                 /* Mark as being used by this device. */
        !           813:                        np->rx_ring[entry].buf_addr = virt_to_le32desc(skb->tail);
        !           814:                }
        !           815:                np->rx_ring[entry].cmd_status = cpu_to_le32(DescIntr | np->rx_buf_sz);
        !           816:        }
        !           817:        return 0;
        !           818: }
        !           819: 
        !           820: /* Initialize the Rx and Tx rings, along with various 'dev' bits. */
        !           821: static void init_ring(struct net_device *dev)
        !           822: {
        !           823:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           824:        int i;
        !           825: 
        !           826:        np->tx_full = 0;
        !           827:        np->cur_rx = np->cur_tx = 0;
        !           828:        np->dirty_rx = np->dirty_tx = 0;
        !           829: 
        !           830:        /* MAX(PKT_BUF_SZ, dev->mtu + 8); */
        !           831:        /* I know you _want_ to change this without understanding it.  Don't. */
        !           832:        np->rx_buf_sz = (dev->mtu <= 1532 ? PKT_BUF_SZ : dev->mtu + 8);
        !           833:        np->rx_head_desc = &np->rx_ring[0];
        !           834: 
        !           835:        /* Initialize all Rx descriptors. */
        !           836:        for (i = 0; i < RX_RING_SIZE; i++) {
        !           837:                np->rx_ring[i].next_desc = virt_to_le32desc(&np->rx_ring[i+1]);
        !           838:                np->rx_ring[i].cmd_status = cpu_to_le32(DescOwn);
        !           839:                np->rx_skbuff[i] = 0;
        !           840:        }
        !           841:        /* Mark the last entry as wrapping the ring. */
        !           842:        np->rx_ring[i-1].next_desc = virt_to_le32desc(&np->rx_ring[0]);
        !           843: 
        !           844:        for (i = 0; i < TX_RING_SIZE; i++) {
        !           845:                np->tx_skbuff[i] = 0;
        !           846:                np->tx_ring[i].next_desc = virt_to_le32desc(&np->tx_ring[i+1]);
        !           847:                np->tx_ring[i].cmd_status = 0;
        !           848:        }
        !           849:        np->tx_ring[i-1].next_desc = virt_to_le32desc(&np->tx_ring[0]);
        !           850: 
        !           851:        /* Fill in the Rx buffers.
        !           852:           Allocation failure just leaves a "negative" np->dirty_rx. */
        !           853:        np->dirty_rx = (unsigned int)(0 - RX_RING_SIZE);
        !           854:        rx_ring_fill(dev);
        !           855: 
        !           856:        return;
        !           857: }
        !           858: 
        !           859: static int start_tx(struct sk_buff *skb, struct net_device *dev)
        !           860: {
        !           861:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !           862:        unsigned int entry;
        !           863: 
        !           864:        /* Block a timer-based transmit from overlapping.  This happens when
        !           865:           packets are presumed lost, and we use this check the Tx status. */
        !           866:        if (netif_pause_tx_queue(dev) != 0) {
        !           867:                /* This watchdog code is redundant with the media monitor timer. */
        !           868:                if (jiffies - dev->trans_start > TX_TIMEOUT)
        !           869:                        tx_timeout(dev);
        !           870:                return 1;
        !           871:        }
        !           872: 
        !           873:        /* Note: Ordering is important here, set the field with the
        !           874:           "ownership" bit last, and only then increment cur_tx.
        !           875:           No spinlock is needed for either Tx or Rx.
        !           876:        */
        !           877: 
        !           878:        /* Calculate the next Tx descriptor entry. */
        !           879:        entry = np->cur_tx % TX_RING_SIZE;
        !           880: 
        !           881:        np->tx_skbuff[entry] = skb;
        !           882: 
        !           883:        np->tx_ring[entry].buf_addr = virt_to_le32desc(skb->data);
        !           884:        np->tx_ring[entry].cmd_status = cpu_to_le32(DescOwn|DescIntr | skb->len);
        !           885:        np->cur_tx++;
        !           886: 
        !           887:        /* For some architectures explicitly flushing np->tx_ring,sizeof(tx_ring)
        !           888:           and skb->data,skb->len improves performance. */
        !           889: 
        !           890:        if (np->cur_tx - np->dirty_tx >= TX_QUEUE_LEN - 1) {
        !           891:                np->tx_full = 1;
        !           892:                /* Check for a just-cleared queue. */
        !           893:                if (np->cur_tx - (volatile unsigned int)np->dirty_tx
        !           894:                        < TX_QUEUE_LEN - 4) {
        !           895:                        np->tx_full = 0;
        !           896:                        netif_unpause_tx_queue(dev);
        !           897:                } else
        !           898:                        netif_stop_tx_queue(dev);
        !           899:        } else
        !           900:                netif_unpause_tx_queue(dev);            /* Typical path */
        !           901:        /* Wake the potentially-idle transmit channel. */
        !           902:        writel(TxOn, dev->base_addr + ChipCmd);
        !           903: 
        !           904:        dev->trans_start = jiffies;
        !           905: 
        !           906:        if (np->msg_level & NETIF_MSG_TX_QUEUED) {
        !           907:                printk(KERN_DEBUG "%s: Transmit frame #%d queued in slot %d.\n",
        !           908:                           dev->name, np->cur_tx, entry);
        !           909:        }
        !           910:        return 0;
        !           911: }
        !           912: 
        !           913: /* The interrupt handler does all of the Rx thread work and cleans up
        !           914:    after the Tx thread. */
        !           915: static void intr_handler(int irq, void *dev_instance, struct pt_regs *rgs)
        !           916: {
        !           917:        struct net_device *dev = (struct net_device *)dev_instance;
        !           918:        struct netdev_private *np;
        !           919:        long ioaddr;
        !           920:        int boguscnt;
        !           921: 
        !           922: #ifndef final_version                  /* Can never occur. */
        !           923:        if (dev == NULL) {
        !           924:                printk (KERN_ERR "Netdev interrupt handler(): IRQ %d for unknown "
        !           925:                                "device.\n", irq);
        !           926:                return;
        !           927:        }
        !           928: #endif
        !           929: 
        !           930:        ioaddr = dev->base_addr;
        !           931:        np = (struct netdev_private *)dev->priv;
        !           932:        boguscnt = np->max_interrupt_work;
        !           933: 
        !           934:        do {
        !           935:                u32 intr_status = readl(ioaddr + IntrStatus);
        !           936: 
        !           937:                if (intr_status == 0 || intr_status == 0xffffffff)
        !           938:                        break;
        !           939: 
        !           940:                /* Acknowledge all of the current interrupt sources ASAP.
        !           941:                   Nominally the read above accomplishes this, but... */
        !           942:                writel(intr_status & 0x001ffff, ioaddr + IntrStatus);
        !           943: 
        !           944:                if (np->msg_level & NETIF_MSG_INTR)
        !           945:                        printk(KERN_DEBUG "%s: Interrupt, status %8.8x.\n",
        !           946:                                   dev->name, intr_status);
        !           947: 
        !           948:                if (intr_status & (IntrRxDone | IntrRxIntr)) {
        !           949:                        netdev_rx(dev);
        !           950:                        np->rx_q_empty = rx_ring_fill(dev);
        !           951:                }
        !           952: 
        !           953:                if (intr_status & (IntrRxIdle | IntrDrv)) {
        !           954:                        unsigned int old_dirty_rx = np->dirty_rx;
        !           955:                        if (rx_ring_fill(dev) == 0)
        !           956:                                np->rx_q_empty = 0;
        !           957:                        /* Restart Rx engine iff we did add a buffer. */
        !           958:                        if (np->dirty_rx != old_dirty_rx)
        !           959:                                writel(RxOn, dev->base_addr + ChipCmd);
        !           960:                }
        !           961: 
        !           962:                for (; np->cur_tx - np->dirty_tx > 0; np->dirty_tx++) {
        !           963:                        int entry = np->dirty_tx % TX_RING_SIZE;
        !           964:                        int tx_status = le32_to_cpu(np->tx_ring[entry].cmd_status);
        !           965:                        if (tx_status & DescOwn)
        !           966:                                break;
        !           967:                        if (np->msg_level & NETIF_MSG_TX_DONE)
        !           968:                                printk(KERN_DEBUG "%s: Transmit done, Tx status %8.8x.\n",
        !           969:                                           dev->name, tx_status);
        !           970:                        if (tx_status & 0x08000000) {
        !           971:                                np->stats.tx_packets++;
        !           972: #if LINUX_VERSION_CODE > 0x20127
        !           973:                                np->stats.tx_bytes += np->tx_skbuff[entry]->len;
        !           974: #endif
        !           975:                        } else {                        /* Various Tx errors */
        !           976:                                if (np->msg_level & NETIF_MSG_TX_ERR)
        !           977:                                        printk(KERN_DEBUG "%s: Transmit error, Tx status %8.8x.\n",
        !           978:                                                   dev->name, tx_status);
        !           979:                                if (tx_status & 0x04010000) np->stats.tx_aborted_errors++;
        !           980:                                if (tx_status & 0x02000000) np->stats.tx_fifo_errors++;
        !           981:                                if (tx_status & 0x01000000) np->stats.tx_carrier_errors++;
        !           982:                                if (tx_status & 0x00200000) np->stats.tx_window_errors++;
        !           983:                                np->stats.tx_errors++;
        !           984:                        }
        !           985:                        /* Free the original skb. */
        !           986:                        dev_free_skb_irq(np->tx_skbuff[entry]);
        !           987:                        np->tx_skbuff[entry] = 0;
        !           988:                }
        !           989:                /* Note the 4 slot hysteresis to mark the queue non-full. */
        !           990:                if (np->tx_full
        !           991:                        && np->cur_tx - np->dirty_tx < TX_QUEUE_LEN - 4) {
        !           992:                        /* The ring is no longer full, allow new TX entries. */
        !           993:                        np->tx_full = 0;
        !           994:                        netif_resume_tx_queue(dev);
        !           995:                }
        !           996: 
        !           997:                /* Abnormal error summary/uncommon events handlers. */
        !           998:                if (intr_status & IntrAbnormalSummary)
        !           999:                        netdev_error(dev, intr_status);
        !          1000: 
        !          1001:                if (--boguscnt < 0) {
        !          1002:                        printk(KERN_WARNING "%s: Too much work at interrupt, "
        !          1003:                                   "status=0x%4.4x.\n",
        !          1004:                                   dev->name, intr_status);
        !          1005:                        np->restore_intr_enable = 1;
        !          1006:                        break;
        !          1007:                }
        !          1008:        } while (1);
        !          1009: 
        !          1010:        if (np->msg_level & NETIF_MSG_INTR)
        !          1011:                printk(KERN_DEBUG "%s: exiting interrupt, status=%#4.4x.\n",
        !          1012:                           dev->name, (int)readl(ioaddr + IntrStatus));
        !          1013: 
        !          1014:        return;
        !          1015: }
        !          1016: 
        !          1017: /* This routine is logically part of the interrupt handler, but separated
        !          1018:    for clarity and better register allocation. */
        !          1019: static int netdev_rx(struct net_device *dev)
        !          1020: {
        !          1021:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1022:        int entry = np->cur_rx % RX_RING_SIZE;
        !          1023:        int boguscnt = np->dirty_rx + RX_RING_SIZE - np->cur_rx;
        !          1024:        s32 desc_status = le32_to_cpu(np->rx_head_desc->cmd_status);
        !          1025: 
        !          1026:        /* If the driver owns the next entry it's a new packet. Send it up. */
        !          1027:        while (desc_status < 0) {               /* e.g. & DescOwn */
        !          1028:                if (np->msg_level & NETIF_MSG_RX_STATUS)
        !          1029:                        printk(KERN_DEBUG "  In netdev_rx() entry %d status was %8.8x.\n",
        !          1030:                                   entry, desc_status);
        !          1031:                if (--boguscnt < 0)
        !          1032:                        break;
        !          1033:                if ((desc_status & (DescMore|DescPktOK|RxTooLong)) != DescPktOK) {
        !          1034:                        if (desc_status & DescMore) {
        !          1035:                                printk(KERN_WARNING "%s: Oversized(?) Ethernet frame spanned "
        !          1036:                                           "multiple buffers, entry %#x status %x.\n",
        !          1037:                                           dev->name, np->cur_rx, desc_status);
        !          1038:                                np->stats.rx_length_errors++;
        !          1039:                        } else {
        !          1040:                                /* There was a error. */
        !          1041:                                if (np->msg_level & NETIF_MSG_RX_ERR)
        !          1042:                                        printk(KERN_DEBUG "  netdev_rx() Rx error was %8.8x.\n",
        !          1043:                                                   desc_status);
        !          1044:                                np->stats.rx_errors++;
        !          1045:                                if (desc_status & 0x06000000) np->stats.rx_over_errors++;
        !          1046:                                if (desc_status & 0x00600000) np->stats.rx_length_errors++;
        !          1047:                                if (desc_status & 0x00140000) np->stats.rx_frame_errors++;
        !          1048:                                if (desc_status & 0x00080000) np->stats.rx_crc_errors++;
        !          1049:                        }
        !          1050:                } else {
        !          1051:                        struct sk_buff *skb;
        !          1052:                        int pkt_len = (desc_status & 0x0fff) - 4;       /* Omit CRC size. */
        !          1053:                        /* Check if the packet is long enough to accept without copying
        !          1054:                           to a minimally-sized skbuff. */
        !          1055:                        if (pkt_len < np->rx_copybreak
        !          1056:                                && (skb = dev_alloc_skb(pkt_len + 2)) != NULL) {
        !          1057:                                skb->dev = dev;
        !          1058:                                skb_reserve(skb, 2);    /* 16 byte align the IP header */
        !          1059: #if defined(HAS_IP_COPYSUM)  ||  (LINUX_VERSION_CODE >= 0x20100)
        !          1060:                                eth_copy_and_sum(skb, np->rx_skbuff[entry]->tail, pkt_len, 0);
        !          1061:                                skb_put(skb, pkt_len);
        !          1062: #else
        !          1063:                                memcpy(skb_put(skb, pkt_len), np->rx_skbuff[entry]->tail,
        !          1064:                                           pkt_len);
        !          1065: #endif
        !          1066:                        } else {
        !          1067:                                skb_put(skb = np->rx_skbuff[entry], pkt_len);
        !          1068:                                np->rx_skbuff[entry] = NULL;
        !          1069:                        }
        !          1070:                        skb->protocol = eth_type_trans(skb, dev);
        !          1071:                        /* W/ hardware checksum: skb->ip_summed = CHECKSUM_UNNECESSARY; */
        !          1072:                        netif_rx(skb);
        !          1073:                        dev->last_rx = jiffies;
        !          1074:                        np->stats.rx_packets++;
        !          1075: #if LINUX_VERSION_CODE > 0x20127
        !          1076:                        np->stats.rx_bytes += pkt_len;
        !          1077: #endif
        !          1078:                }
        !          1079:                entry = (++np->cur_rx) % RX_RING_SIZE;
        !          1080:                np->rx_head_desc = &np->rx_ring[entry];
        !          1081:                desc_status = le32_to_cpu(np->rx_head_desc->cmd_status);
        !          1082:        }
        !          1083: 
        !          1084:        /* Refill is now done in the main interrupt loop. */
        !          1085:        return 0;
        !          1086: }
        !          1087: 
        !          1088: static void netdev_error(struct net_device *dev, int intr_status)
        !          1089: {
        !          1090:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1091:        long ioaddr = dev->base_addr;
        !          1092: 
        !          1093:        if (intr_status & LinkChange) {
        !          1094:                int chip_config = readl(ioaddr + ChipConfig);
        !          1095:                if (np->msg_level & NETIF_MSG_LINK)
        !          1096:                        printk(KERN_NOTICE "%s: Link changed: Autonegotiation advertising"
        !          1097:                                   " %4.4x  partner %4.4x.\n", dev->name,
        !          1098:                                   (int)readw(ioaddr + NS_MII_Advert),
        !          1099:                                   (int)readw(ioaddr + NS_MIILinkPartner));
        !          1100:                if (chip_config & CfgLinkGood)
        !          1101:                        netif_link_up(dev);
        !          1102:                else
        !          1103:                        netif_link_down(dev);
        !          1104:                check_duplex(dev);
        !          1105:        }
        !          1106:        if (intr_status & StatsMax) {
        !          1107:                get_stats(dev);
        !          1108:        }
        !          1109:        if (intr_status & IntrTxUnderrun) {
        !          1110:                /* Increase the Tx threshold, 32 byte units. */
        !          1111:                if ((np->tx_config & 0x3f) < 62)
        !          1112:                        np->tx_config += 2;                     /* +64 bytes */
        !          1113:                writel(np->tx_config, ioaddr + TxConfig);
        !          1114:        }
        !          1115:        if (intr_status & WOLPkt) {
        !          1116:                int wol_status = readl(ioaddr + WOLCmd);
        !          1117:                printk(KERN_NOTICE "%s: Link wake-up event %8.8x",
        !          1118:                           dev->name, wol_status);
        !          1119:        }
        !          1120:        if (intr_status & (RxStatusOverrun | IntrRxOverrun)) {
        !          1121:                if (np->msg_level & NETIF_MSG_DRV)
        !          1122:                        printk(KERN_ERR "%s: Rx overflow! ns815 %8.8x.\n",
        !          1123:                                   dev->name, intr_status);
        !          1124:                np->stats.rx_fifo_errors++;
        !          1125:        }
        !          1126:        if (intr_status & ~(LinkChange|StatsMax|RxResetDone|TxResetDone|
        !          1127:                                                RxStatusOverrun|0xA7ff)) {
        !          1128:                if (np->msg_level & NETIF_MSG_DRV)
        !          1129:                        printk(KERN_ERR "%s: Something Wicked happened! natsemi %8.8x.\n",
        !          1130:                                   dev->name, intr_status);
        !          1131:        }
        !          1132:        /* Hmmmmm, it's not clear how to recover from PCI faults. */
        !          1133:        if (intr_status & IntrPCIErr) {
        !          1134:                np->stats.tx_fifo_errors++;
        !          1135:                np->stats.rx_fifo_errors++;
        !          1136:        }
        !          1137: }
        !          1138: 
        !          1139: static struct net_device_stats *get_stats(struct net_device *dev)
        !          1140: {
        !          1141:        long ioaddr = dev->base_addr;
        !          1142:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1143:        int crc_errs = readl(ioaddr + RxCRCErrs);
        !          1144: 
        !          1145:        if (crc_errs != 0xffffffff) {
        !          1146:                /* We need not lock this segment of code for SMP.
        !          1147:                   There is no atomic-add vulnerability for most CPUs,
        !          1148:                   and statistics are non-critical. */
        !          1149:                /* The chip only need report frame silently dropped. */
        !          1150:                np->stats.rx_crc_errors += crc_errs;
        !          1151:                np->stats.rx_missed_errors += readl(ioaddr + RxMissed);
        !          1152:        }
        !          1153: 
        !          1154:        return &np->stats;
        !          1155: }
        !          1156: 
        !          1157: /* The big-endian AUTODIN II ethernet CRC calculations.
        !          1158:    See ns820.c for how to fill the table on new chips.
        !          1159:  */
        !          1160: static unsigned const ethernet_polynomial = 0x04c11db7U;
        !          1161: static inline u32 ether_crc(int length, unsigned char *data)
        !          1162: {
        !          1163:        int crc = -1;
        !          1164: 
        !          1165:        while(--length >= 0) {
        !          1166:                unsigned char current_octet = *data++;
        !          1167:                int bit;
        !          1168:                for (bit = 0; bit < 8; bit++, current_octet >>= 1)
        !          1169:                        crc = (crc << 1) ^
        !          1170:                                ((crc < 0) ^ (current_octet & 1) ? ethernet_polynomial : 0);
        !          1171:        }
        !          1172:        return crc;
        !          1173: }
        !          1174: 
        !          1175: static void set_rx_mode(struct net_device *dev)
        !          1176: {
        !          1177:        long ioaddr = dev->base_addr;
        !          1178:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1179:        u8 mc_filter[64];                       /* Multicast hash filter */
        !          1180:        u32 rx_mode;
        !          1181: 
        !          1182:        if (dev->flags & IFF_PROMISC) {                 /* Set promiscuous. */
        !          1183:                /* Unconditionally log net taps. */
        !          1184:                printk(KERN_NOTICE "%s: Promiscuous mode enabled.\n", dev->name);
        !          1185:                rx_mode = AcceptBroadcast | AcceptAllMulticast | AcceptAllPhys
        !          1186:                        | AcceptMyPhys;
        !          1187:        } else if ((dev->mc_count > np->multicast_filter_limit)
        !          1188:                           ||  (dev->flags & IFF_ALLMULTI)) {
        !          1189:                rx_mode = AcceptBroadcast | AcceptAllMulticast | AcceptMyPhys;
        !          1190:        } else {
        !          1191:                struct dev_mc_list *mclist;
        !          1192:                int i;
        !          1193:                memset(mc_filter, 0, sizeof(mc_filter));
        !          1194:                for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count;
        !          1195:                         i++, mclist = mclist->next) {
        !          1196:                        int filterbit = ether_crc(ETH_ALEN, mclist->dmi_addr);
        !          1197:                        set_bit(filterbit & 0x1ff, mc_filter);
        !          1198:                        if (np->msg_level & NETIF_MSG_RXFILTER)
        !          1199:                                printk(KERN_INFO "%s: Added filter for %2.2x:%2.2x:%2.2x:"
        !          1200:                                           "%2.2x:%2.2x:%2.2x  crc %8.8x bit %d.\n", dev->name,
        !          1201:                                           mclist->dmi_addr[0], mclist->dmi_addr[1],
        !          1202:                                           mclist->dmi_addr[2], mclist->dmi_addr[3],
        !          1203:                                           mclist->dmi_addr[4], mclist->dmi_addr[5],
        !          1204:                                           filterbit, filterbit & 0x1ff);
        !          1205:                }
        !          1206:                rx_mode = AcceptBroadcast | AcceptMulticast | AcceptMyPhys;
        !          1207:                for (i = 0; i < 64; i += 2) {
        !          1208:                        u16 filterword = (mc_filter[i+1]<<8) + mc_filter[i];
        !          1209:                        if (filterword != np->rx_filter[i>>2]) {
        !          1210:                                writel(0x200 + i, ioaddr + RxFilterAddr);
        !          1211:                                writel(filterword, ioaddr + RxFilterData);
        !          1212:                                np->rx_filter[i>>2] = filterword;
        !          1213:                        }
        !          1214:                }
        !          1215:        }
        !          1216:        writel(rx_mode, ioaddr + RxFilterAddr);
        !          1217:        np->cur_rx_mode = rx_mode;
        !          1218: }
        !          1219: 
        !          1220: static int mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
        !          1221: {
        !          1222:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1223:        u16 *data = (u16 *)&rq->ifr_data;
        !          1224:        u32 *data32 = (void *)&rq->ifr_data;
        !          1225: 
        !          1226:        switch(cmd) {
        !          1227:        case 0x8947: case 0x89F0:
        !          1228:                /* SIOCGMIIPHY: Get the address of the PHY in use. */
        !          1229:                data[0] = 1;
        !          1230:                /* Fall Through */
        !          1231:        case 0x8948: case 0x89F1:
        !          1232:                /* SIOCGMIIREG: Read the specified MII register. */
        !          1233:                data[3] = mdio_read(dev, data[0] & 0x1f, data[1] & 0x1f);
        !          1234:                return 0;
        !          1235:        case 0x8949: case 0x89F2:
        !          1236:                /* SIOCSMIIREG: Write the specified MII register */
        !          1237:                if (!capable(CAP_NET_ADMIN))
        !          1238:                        return -EPERM;
        !          1239:                if (data[0] == 1) {
        !          1240:                        u16 miireg = data[1] & 0x1f;
        !          1241:                        u16 value = data[2];
        !          1242:                        mdio_write(dev, 1, miireg, value);
        !          1243:                        switch (miireg) {
        !          1244:                        case 0:
        !          1245:                                /* Check for autonegotiation on or reset. */
        !          1246:                                np->duplex_lock = (value & 0x9000) ? 0 : 1;
        !          1247:                                if (np->duplex_lock)
        !          1248:                                        np->full_duplex = (value & 0x0100) ? 1 : 0;
        !          1249:                                break;
        !          1250:                        case 4: np->advertising = value; break;
        !          1251:                        }
        !          1252:                }
        !          1253:                return 0;
        !          1254:        case SIOCGPARAMS:
        !          1255:                data32[0] = np->msg_level;
        !          1256:                data32[1] = np->multicast_filter_limit;
        !          1257:                data32[2] = np->max_interrupt_work;
        !          1258:                data32[3] = np->rx_copybreak;
        !          1259:                return 0;
        !          1260:        case SIOCSPARAMS:
        !          1261:                if (!capable(CAP_NET_ADMIN))
        !          1262:                        return -EPERM;
        !          1263:                np->msg_level = data32[0];
        !          1264:                np->multicast_filter_limit = data32[1];
        !          1265:                np->max_interrupt_work = data32[2];
        !          1266:                np->rx_copybreak = data32[3];
        !          1267:                return 0;
        !          1268:        default:
        !          1269:                return -EOPNOTSUPP;
        !          1270:        }
        !          1271: }
        !          1272: 
        !          1273: static int netdev_close(struct net_device *dev)
        !          1274: {
        !          1275:        long ioaddr = dev->base_addr;
        !          1276:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1277:        int i;
        !          1278: 
        !          1279:        netif_stop_tx_queue(dev);
        !          1280: 
        !          1281:        if (np->msg_level & NETIF_MSG_IFDOWN) {
        !          1282:                printk(KERN_DEBUG "%s: Shutting down ethercard, status was %4.4x "
        !          1283:                           "Int %2.2x.\n",
        !          1284:                           dev->name, (int)readl(ioaddr + ChipCmd),
        !          1285:                           (int)readl(ioaddr + IntrStatus));
        !          1286:                printk(KERN_DEBUG "%s: Queue pointers were Tx %d / %d,  Rx %d / %d.\n",
        !          1287:                           dev->name, np->cur_tx, np->dirty_tx, np->cur_rx, np->dirty_rx);
        !          1288:        }
        !          1289: 
        !          1290:        /* We don't want the timer to re-start anything. */
        !          1291:        del_timer(&np->timer);
        !          1292: 
        !          1293:        /* Disable interrupts using the mask. */
        !          1294:        writel(0, ioaddr + IntrMask);
        !          1295:        writel(0, ioaddr + IntrEnable);
        !          1296:        writel(2, ioaddr + StatsCtrl);                                  /* Freeze Stats */
        !          1297: 
        !          1298:        /* Stop the chip's Tx and Rx processes. */
        !          1299:        writel(RxOff | TxOff, ioaddr + ChipCmd);
        !          1300: 
        !          1301:        get_stats(dev);
        !          1302: 
        !          1303: #ifdef __i386__
        !          1304:        if (np->msg_level & NETIF_MSG_IFDOWN) {
        !          1305:                printk("\n"KERN_DEBUG"  Tx ring at %8.8x:\n",
        !          1306:                           (int)virt_to_bus(np->tx_ring));
        !          1307:                for (i = 0; i < TX_RING_SIZE; i++)
        !          1308:                        printk(" #%d desc. %8.8x %8.8x.\n",
        !          1309:                                   i, np->tx_ring[i].cmd_status, (u32)np->tx_ring[i].buf_addr);
        !          1310:                printk("\n"KERN_DEBUG "  Rx ring %8.8x:\n",
        !          1311:                           (int)virt_to_bus(np->rx_ring));
        !          1312:                for (i = 0; i < RX_RING_SIZE; i++) {
        !          1313:                        printk(KERN_DEBUG " #%d desc. %8.8x %8.8x\n",
        !          1314:                                   i, np->rx_ring[i].cmd_status, (u32)np->rx_ring[i].buf_addr);
        !          1315:                }
        !          1316:        }
        !          1317: #endif /* __i386__ debugging only */
        !          1318: 
        !          1319:        free_irq(dev->irq, dev);
        !          1320: 
        !          1321:        /* Free all the skbuffs in the Rx queue. */
        !          1322:        for (i = 0; i < RX_RING_SIZE; i++) {
        !          1323:                np->rx_ring[i].cmd_status = 0;
        !          1324:                np->rx_ring[i].buf_addr = 0xBADF00D0; /* An invalid address. */
        !          1325:                if (np->rx_skbuff[i]) {
        !          1326: #if LINUX_VERSION_CODE < 0x20100
        !          1327:                        np->rx_skbuff[i]->free = 1;
        !          1328: #endif
        !          1329:                        dev_free_skb(np->rx_skbuff[i]);
        !          1330:                }
        !          1331:                np->rx_skbuff[i] = 0;
        !          1332:        }
        !          1333:        for (i = 0; i < TX_RING_SIZE; i++) {
        !          1334:                if (np->tx_skbuff[i])
        !          1335:                        dev_free_skb(np->tx_skbuff[i]);
        !          1336:                np->tx_skbuff[i] = 0;
        !          1337:        }
        !          1338: 
        !          1339: #if 0
        !          1340:        writel(0x0200, ioaddr + ChipConfig); /* Power down Xcvr. */
        !          1341: #endif
        !          1342: 
        !          1343:        MOD_DEC_USE_COUNT;
        !          1344: 
        !          1345:        return 0;
        !          1346: }
        !          1347: 
        !          1348: static int power_event(void *dev_instance, int event)
        !          1349: {
        !          1350:        struct net_device *dev = dev_instance;
        !          1351:        struct netdev_private *np = (struct netdev_private *)dev->priv;
        !          1352:        long ioaddr = dev->base_addr;
        !          1353: 
        !          1354:        if (np->msg_level & NETIF_MSG_LINK)
        !          1355:                printk(KERN_DEBUG "%s: Handling power event %d.\n", dev->name, event);
        !          1356:        switch(event) {
        !          1357:        case DRV_ATTACH:
        !          1358:                MOD_INC_USE_COUNT;
        !          1359:                break;
        !          1360:        case DRV_SUSPEND:
        !          1361:                /* Disable interrupts, freeze stats, stop Tx and Rx. */
        !          1362:                writel(0, ioaddr + IntrEnable);
        !          1363:                writel(2, ioaddr + StatsCtrl);
        !          1364:                writel(RxOff | TxOff, ioaddr + ChipCmd);
        !          1365:                break;
        !          1366:        case DRV_RESUME:
        !          1367:                /* This is incomplete: the open() actions should be repeated. */
        !          1368:                set_rx_mode(dev);
        !          1369:                writel(np->intr_enable, ioaddr + IntrEnable);
        !          1370:                writel(1, ioaddr + IntrEnable);
        !          1371:                writel(RxOn | TxOn, ioaddr + ChipCmd);
        !          1372:                break;
        !          1373:        case DRV_DETACH: {
        !          1374:                struct net_device **devp, **next;
        !          1375:                if (dev->flags & IFF_UP) {
        !          1376:                        /* Some, but not all, kernel versions close automatically. */
        !          1377:                        dev_close(dev);
        !          1378:                        dev->flags &= ~(IFF_UP|IFF_RUNNING);
        !          1379:                }
        !          1380:                unregister_netdev(dev);
        !          1381:                release_region(dev->base_addr, pci_id_tbl[np->chip_id].io_size);
        !          1382:                for (devp = &root_net_dev; *devp; devp = next) {
        !          1383:                        next = &((struct netdev_private *)(*devp)->priv)->next_module;
        !          1384:                        if (*devp == dev) {
        !          1385:                                *devp = *next;
        !          1386:                                break;
        !          1387:                        }
        !          1388:                }
        !          1389:                if (np->priv_addr)
        !          1390:                        kfree(np->priv_addr);
        !          1391:                kfree(dev);
        !          1392:                MOD_DEC_USE_COUNT;
        !          1393:                break;
        !          1394:        }
        !          1395:        }
        !          1396: 
        !          1397:        return 0;
        !          1398: }
        !          1399: 
        !          1400: 
        !          1401: #ifdef MODULE
        !          1402: int init_module(void)
        !          1403: {
        !          1404:        if (debug >= NETIF_MSG_DRV)     /* Emit version even if no cards detected. */
        !          1405:                printk(KERN_INFO "%s" KERN_INFO "%s", version1, version2);
        !          1406: #ifdef CARDBUS
        !          1407:        register_driver(&etherdev_ops);
        !          1408:        return 0;
        !          1409: #else
        !          1410:        return pci_drv_register(&natsemi_drv_id, NULL);
        !          1411: #endif
        !          1412: }
        !          1413: 
        !          1414: void cleanup_module(void)
        !          1415: {
        !          1416:        struct net_device *next_dev;
        !          1417: 
        !          1418: #ifdef CARDBUS
        !          1419:        unregister_driver(&etherdev_ops);
        !          1420: #else
        !          1421:        pci_drv_unregister(&natsemi_drv_id);
        !          1422: #endif
        !          1423: 
        !          1424:        /* No need to check MOD_IN_USE, as sys_delete_module() checks. */
        !          1425:        while (root_net_dev) {
        !          1426:                struct netdev_private *np = (void *)(root_net_dev->priv);
        !          1427:                unregister_netdev(root_net_dev);
        !          1428:                iounmap((char *)root_net_dev->base_addr);
        !          1429:                next_dev = np->next_module;
        !          1430:                if (np->priv_addr)
        !          1431:                        kfree(np->priv_addr);
        !          1432:                kfree(root_net_dev);
        !          1433:                root_net_dev = next_dev;
        !          1434:        }
        !          1435: }
        !          1436: 
        !          1437: #endif  /* MODULE */
        !          1438: 
        !          1439: /*
        !          1440:  * Local variables:
        !          1441:  *  compile-command: "make KERNVER=`uname -r` natsemi.o"
        !          1442:  *  compile-cmd: "gcc -DMODULE -Wall -Wstrict-prototypes -O6 -c natsemi.c"
        !          1443:  *  simple-compile-command: "gcc -DMODULE -O6 -c natsemi.c"
        !          1444:  *  c-indent-level: 4
        !          1445:  *  c-basic-offset: 4
        !          1446:  *  tab-width: 4
        !          1447:  * End:
        !          1448:  */

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