8139too.c

/*

	8139too.c: A RealTek RTL-8139 Fast Ethernet driver for Linux.

	Maintained by Jeff Garzik <jgarzik@pobox.com>
	Copyright 2000-2002 Jeff Garzik

	Much code comes from Donald Becker's rtl8139.c driver,
	versions 1.13 and older.  This driver was originally based
	on rtl8139.c version 1.07.  Header of rtl8139.c version 1.13:

	-----<snip>-----

        	Written 1997-2001 by Donald Becker.
		This software may be used and distributed according to the
		terms of the GNU General Public License (GPL), incorporated
		herein by reference.  Drivers based on or derived from this
		code fall under the GPL and must retain the authorship,
		copyright and license notice.  This file is not a complete
		program and may only be used when the entire operating
		system is licensed under the GPL.

		This driver is for boards based on the RTL8129 and RTL8139
		PCI ethernet chips.

		The author may be reached as becker@scyld.com, or C/O Scyld
		Computing Corporation 410 Severn Ave., Suite 210 Annapolis
		MD 21403

		Support and updates available at
		http://www.scyld.com/network/rtl8139.html

		Twister-tuning table provided by Kinston
		<shangh@realtek.com.tw>.

	-----<snip>-----

	This software may be used and distributed according to the terms
	of the GNU General Public License, incorporated herein by reference.

	Contributors:

		Donald Becker - he wrote the original driver, kudos to him!
		(but please don't e-mail him for support, this isn't his driver)

		Tigran Aivazian - bug fixes, skbuff free cleanup

		Martin Mares - suggestions for PCI cleanup

		David S. Miller - PCI DMA and softnet updates

		Ernst Gill - fixes ported from BSD driver

		Daniel Kobras - identified specific locations of
			posted MMIO write bugginess

		Gerard Sharp - bug fix, testing and feedback

		David Ford - Rx ring wrap fix

		Dan DeMaggio - swapped RTL8139 cards with me, and allowed me
		to find and fix a crucial bug on older chipsets.

		Donald Becker/Chris Butterworth/Marcus Westergren -
		Noticed various Rx packet size-related buglets.

		Santiago Garcia Mantinan - testing and feedback

		Jens David - 2.2.x kernel backports

		Martin Dennett - incredibly helpful insight on undocumented
		features of the 8139 chips

		Jean-Jacques Michel - bug fix

		Tobias Ringstrm - Rx interrupt status checking suggestion

		Andrew Morton - Clear blocked signals, avoid
		buffer overrun setting current->comm.

		Kalle Olavi Niemitalo - Wake-on-LAN ioctls

		Robert Kuebel - Save kernel thread from dying on any signal.

	Submitting bug reports:

		"rtl8139-diag -mmmaaavvveefN" output
		enable RTL8139_DEBUG below, and look at 'dmesg' or kernel log

*/

#define DRV_NAME	"8139too"
#define DRV_VERSION	"0.9.27"


#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/compiler.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/rtnetlink.h>
#include <linux/delay.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/completion.h>
#include <linux/crc32.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/irq.h>

#define RTL8139_DRIVER_NAME   DRV_NAME " Fast Ethernet driver " DRV_VERSION
#define PFX DRV_NAME ": "

/* Default Message level */
#define RTL8139_DEF_MSG_ENABLE   (NETIF_MSG_DRV   | \
                                 NETIF_MSG_PROBE  | \
                                 NETIF_MSG_LINK)


/* enable PIO instead of MMIO, if CONFIG_8139TOO_PIO is selected */
#ifdef CONFIG_8139TOO_PIO
#define USE_IO_OPS 1
#endif

/* define to 1, 2 or 3 to enable copious debugging info */
#define RTL8139_DEBUG 0

/* define to 1 to disable lightweight runtime debugging checks */
#undef RTL8139_NDEBUG


#if RTL8139_DEBUG
/* note: prints function name for you */
#  define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: " fmt, __FUNCTION__ , ## args)
#else
#  define DPRINTK(fmt, args...)
#endif

#ifdef RTL8139_NDEBUG
#  define assert(expr) do {} while (0)
#else
#  define assert(expr) \
        if(unlikely(!(expr))) {				        \
        printk(KERN_ERR "Assertion failed! %s,%s,%s,line=%d\n",	\
        #expr,__FILE__,__FUNCTION__,__LINE__);		        \
        }
#endif


/* A few user-configurable values. */
/* media options */
#define MAX_UNITS 8
static int media[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};

/* Maximum number of multicast addresses to filter (vs. Rx-all-multicast).
   The RTL chips use a 64 element hash table based on the Ethernet CRC.  */
static int multicast_filter_limit = 32;

/* bitmapped message enable number */
static int debug = -1;

/*
 * Receive ring size 
 * Warning: 64K ring has hardware issues and may lock up.
 */
#if defined(CONFIG_SH_DREAMCAST)
#define RX_BUF_IDX	1	/* 16K ring */
#else
#define RX_BUF_IDX	2	/* 32K ring */
#endif
#define RX_BUF_LEN	(8192 << RX_BUF_IDX)
#define RX_BUF_PAD	16
#define RX_BUF_WRAP_PAD 2048 /* spare padding to handle lack of packet wrap */

#if RX_BUF_LEN == 65536
#define RX_BUF_TOT_LEN	RX_BUF_LEN
#else
#define RX_BUF_TOT_LEN	(RX_BUF_LEN + RX_BUF_PAD + RX_BUF_WRAP_PAD)
#endif

/* Number of Tx descriptor registers. */
#define NUM_TX_DESC	4

/* max supported ethernet frame size -- must be at least (dev->mtu+14+4).*/
#define MAX_ETH_FRAME_SIZE	1536

/* Size of the Tx bounce buffers -- must be at least (dev->mtu+14+4). */
#define TX_BUF_SIZE	MAX_ETH_FRAME_SIZE
#define TX_BUF_TOT_LEN	(TX_BUF_SIZE * NUM_TX_DESC)

/* PCI Tuning Parameters
   Threshold is bytes transferred to chip before transmission starts. */
#define TX_FIFO_THRESH 256	/* In bytes, rounded down to 32 byte units. */

/* The following settings are log_2(bytes)-4:  0 == 16 bytes .. 6==1024, 7==end of packet. */
#define RX_FIFO_THRESH	7	/* Rx buffer level before first PCI xfer.  */
#define RX_DMA_BURST	7	/* Maximum PCI burst, '6' is 1024 */
#define TX_DMA_BURST	6	/* Maximum PCI burst, '6' is 1024 */
#define TX_RETRY	8	/* 0-15.  retries = 16 + (TX_RETRY * 16) */

/* Operational parameters that usually are not changed. */
/* Time in jiffies before concluding the transmitter is hung. */
#define TX_TIMEOUT  (6*HZ)


enum {
	HAS_MII_XCVR = 0x010000,
	HAS_CHIP_XCVR = 0x020000,
	HAS_LNK_CHNG = 0x040000,
};

#define RTL_NUM_STATS 4		/* number of ETHTOOL_GSTATS u64's */
#define RTL_REGS_VER 1		/* version of reg. data in ETHTOOL_GREGS */
#define RTL_MIN_IO_SIZE 0x80
#define RTL8139B_IO_SIZE 256

#define RTL8129_CAPS	HAS_MII_XCVR
#define RTL8139_CAPS	HAS_CHIP_XCVR|HAS_LNK_CHNG

typedef enum {
	RTL8139 = 0,
	RTL8129,
} board_t;


/* indexed by board_t, above */
static struct {
	const char *name;
	u32 hw_flags;
} board_info[] __devinitdata = {
	{ "RealTek RTL8139", RTL8139_CAPS },
	{ "RealTek RTL8129", RTL8129_CAPS },
};


static struct pci_device_id rtl8139_pci_tbl[] = {
	{0x10ec, 0x8139, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x10ec, 0x8138, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x1113, 0x1211, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x1500, 0x1360, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x4033, 0x1360, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x1186, 0x1300, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x1186, 0x1340, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x13d1, 0xab06, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x1259, 0xa117, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x1259, 0xa11e, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x14ea, 0xab06, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x14ea, 0xab07, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x11db, 0x1234, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x1432, 0x9130, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x02ac, 0x1012, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x018a, 0x0106, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x126c, 0x1211, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x1743, 0x8139, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
	{0x021b, 0x8139, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 }, 

#ifdef CONFIG_SH_SECUREEDGE5410
	/* Bogus 8139 silicon reports 8129 without external PROM :-( */
	{0x10ec, 0x8129, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8139 },
#endif
#ifdef CONFIG_8139TOO_8129
	{0x10ec, 0x8129, PCI_ANY_ID, PCI_ANY_ID, 0, 0, RTL8129 },
#endif

	/* some crazy cards report invalid vendor ids like
	 * 0x0001 here.  The other ids are valid and constant,
	 * so we simply don't match on the main vendor id.
	 */
	{PCI_ANY_ID, 0x8139, 0x10ec, 0x8139, 0, 0, RTL8139 },
	{PCI_ANY_ID, 0x8139, 0x1186, 0x1300, 0, 0, RTL8139 },
	{PCI_ANY_ID, 0x8139, 0x13d1, 0xab06, 0, 0, RTL8139 },

	{0,}
};
MODULE_DEVICE_TABLE (pci, rtl8139_pci_tbl);

static struct {
	const char str[ETH_GSTRING_LEN];
} ethtool_stats_keys[] = {
	{ "early_rx" },
	{ "tx_buf_mapped" },
	{ "tx_timeouts" },
	{ "rx_lost_in_ring" },
};

/* The rest of these values should never change. */

/* Symbolic offsets to registers. */
enum RTL8139_registers {
	MAC0 = 0,		/* Ethernet hardware address. */
	MAR0 = 8,		/* Multicast filter. */
	TxStatus0 = 0x10,	/* Transmit status (Four 32bit registers). */
	TxAddr0 = 0x20,		/* Tx descriptors (also four 32bit). */
	RxBuf = 0x30,
	ChipCmd = 0x37,
	RxBufPtr = 0x38,
	RxBufAddr = 0x3A,
	IntrMask = 0x3C,
	IntrStatus = 0x3E,
	TxConfig = 0x40,
	RxConfig = 0x44,
	Timer = 0x48,		/* A general-purpose counter. */
	RxMissed = 0x4C,	/* 24 bits valid, write clears. */
	Cfg9346 = 0x50,
	Config0 = 0x51,
	Config1 = 0x52,
	FlashReg = 0x54,
	MediaStatus = 0x58,
	Config3 = 0x59,
	Config4 = 0x5A,		/* absent on RTL-8139A */
	HltClk = 0x5B,
	MultiIntr = 0x5C,
	TxSummary = 0x60,
	BasicModeCtrl = 0x62,
	BasicModeStatus = 0x64,
	NWayAdvert = 0x66,
	NWayLPAR = 0x68,
	NWayExpansion = 0x6A,
	/* Undocumented registers, but required for proper operation. */
	FIFOTMS = 0x70,		/* FIFO Control and test. */
	CSCR = 0x74,		/* Chip Status and Configuration Register. */
	PARA78 = 0x78,
	PARA7c = 0x7c,		/* Magic transceiver parameter register. */
	Config5 = 0xD8,		/* absent on RTL-8139A */
};

enum ClearBitMasks {
	MultiIntrClear = 0xF000,
	ChipCmdClear = 0xE2,
	Config1Clear = (1<<7)|(1<<6)|(1<<3)|(1<<2)|(1<<1),
};

enum ChipCmdBits {
	CmdReset = 0x10,
	CmdRxEnb = 0x08,
	CmdTxEnb = 0x04,
	RxBufEmpty = 0x01,
};

/* Interrupt register bits, using my own meaningful names. */
enum IntrStatusBits {
	PCIErr = 0x8000,
	PCSTimeout = 0x4000,
	RxFIFOOver = 0x40,
	RxUnderrun = 0x20,
	RxOverflow = 0x10,
	TxErr = 0x08,
	TxOK = 0x04,
	RxErr = 0x02,
	RxOK = 0x01,

	RxAckBits = RxFIFOOver | RxOverflow | RxOK,
};

enum TxStatusBits {
	TxHostOwns = 0x2000,
	TxUnderrun = 0x4000,
	TxStatOK = 0x8000,
	TxOutOfWindow = 0x20000000,
	TxAborted = 0x40000000,
	TxCarrierLost = 0x80000000,
};
enum RxStatusBits {
	RxMulticast = 0x8000,
	RxPhysical = 0x4000,
	RxBroadcast = 0x2000,
	RxBadSymbol = 0x0020,
	RxRunt = 0x0010,
	RxTooLong = 0x0008,
	RxCRCErr = 0x0004,
	RxBadAlign = 0x0002,
	RxStatusOK = 0x0001,
};

/* Bits in RxConfig. */
enum rx_mode_bits {
	AcceptErr = 0x20,
	AcceptRunt = 0x10,
	AcceptBroadcast = 0x08,
	AcceptMulticast = 0x04,
	AcceptMyPhys = 0x02,
	AcceptAllPhys = 0x01,
};

/* Bits in TxConfig. */
enum tx_config_bits {

        /* Interframe Gap Time. Only TxIFG96 doesn't violate IEEE 802.3 */
        TxIFGShift = 24,
        TxIFG84 = (0 << TxIFGShift),    /* 8.4us / 840ns (10 / 100Mbps) */
        TxIFG88 = (1 << TxIFGShift),    /* 8.8us / 880ns (10 / 100Mbps) */
        TxIFG92 = (2 << TxIFGShift),    /* 9.2us / 920ns (10 / 100Mbps) */
        TxIFG96 = (3 << TxIFGShift),    /* 9.6us / 960ns (10 / 100Mbps) */

	TxLoopBack = (1 << 18) | (1 << 17), /* enable loopback test mode */
	TxCRC = (1 << 16),	/* DISABLE appending CRC to end of Tx packets */
	TxClearAbt = (1 << 0),	/* Clear abort (WO) */
	TxDMAShift = 8,		/* DMA burst value (0-7) is shifted this many bits */
	TxRetryShift = 4,	/* TXRR value (0-15) is shifted this many bits */

	TxVersionMask = 0x7C800000, /* mask out version bits 30-26, 23 */
};

/* Bits in Config1 */
enum Config1Bits {
	Cfg1_PM_Enable = 0x01,
	Cfg1_VPD_Enable = 0x02,
	Cfg1_PIO = 0x04,
	Cfg1_MMIO = 0x08,
	LWAKE = 0x10,		/* not on 8139, 8139A */
	Cfg1_Driver_Load = 0x20,
	Cfg1_LED0 = 0x40,
	Cfg1_LED1 = 0x80,
	SLEEP = (1 << 1),	/* only on 8139, 8139A */
	PWRDN = (1 << 0),	/* only on 8139, 8139A */
};

/* Bits in Config3 */
enum Config3Bits {
	Cfg3_FBtBEn    = (1 << 0), /* 1 = Fast Back to Back */
	Cfg3_FuncRegEn = (1 << 1), /* 1 = enable CardBus Function registers */
	Cfg3_CLKRUN_En = (1 << 2), /* 1 = enable CLKRUN */
	Cfg3_CardB_En  = (1 << 3), /* 1 = enable CardBus registers */
	Cfg3_LinkUp    = (1 << 4), /* 1 = wake up on link up */
	Cfg3_Magic     = (1 << 5), /* 1 = wake up on Magic Packet (tm) */
	Cfg3_PARM_En   = (1 << 6), /* 0 = software can set twister parameters */
	Cfg3_GNTSel    = (1 << 7), /* 1 = delay 1 clock from PCI GNT signal */
};

/* Bits in Config4 */
enum Config4Bits {
	LWPTN = (1 << 2),	/* not on 8139, 8139A */
};

/* Bits in Config5 */
enum Config5Bits {
	Cfg5_PME_STS     = (1 << 0), /* 1 = PCI reset resets PME_Status */
	Cfg5_LANWake     = (1 << 1), /* 1 = enable LANWake signal */
	Cfg5_LDPS        = (1 << 2), /* 0 = save power when link is down */
	Cfg5_FIFOAddrPtr = (1 << 3), /* Realtek internal SRAM testing */
	Cfg5_UWF         = (1 << 4), /* 1 = accept unicast wakeup frame */
	Cfg5_MWF         = (1 << 5), /* 1 = accept multicast wakeup frame */
	Cfg5_BWF         = (1 << 6), /* 1 = accept broadcast wakeup frame */
};

enum RxConfigBits {
	/* rx fifo threshold */
	RxCfgFIFOShift = 13,
	RxCfgFIFONone = (7 << RxCfgFIFOShift),

	/* Max DMA burst */
	RxCfgDMAShift = 8,
	RxCfgDMAUnlimited = (7 << RxCfgDMAShift),

	/* rx ring buffer length */
	RxCfgRcv8K = 0,
	RxCfgRcv16K = (1 << 11),
	RxCfgRcv32K = (1 << 12),
	RxCfgRcv64K = (1 << 11) | (1 << 12),

	/* Disable packet wrap at end of Rx buffer. (not possible with 64k) */
	RxNoWrap = (1 << 7),
};

/* Twister tuning parameters from RealTek.
   Completely undocumented, but required to tune bad links on some boards. */
enum CSCRBits {
	CSCR_LinkOKBit = 0x0400,
	CSCR_LinkChangeBit = 0x0800,
	CSCR_LinkStatusBits = 0x0f000,
	CSCR_LinkDownOffCmd = 0x003c0,
	CSCR_LinkDownCmd = 0x0f3c0,
};

enum Cfg9346Bits {
	Cfg9346_Lock = 0x00,
	Cfg9346_Unlock = 0xC0,
};

typedef enum {
	CH_8139 = 0,
	CH_8139_K,
	CH_8139A,
	CH_8139A_G,
	CH_8139B,
	CH_8130,
	CH_8139C,
	CH_8100,
	CH_8100B_8139D,
	CH_8101,
} chip_t;

enum chip_flags {
	HasHltClk = (1 << 0),
	HasLWake = (1 << 1),
};

#define HW_REVID(b30, b29, b28, b27, b26, b23, b22) \
	(b30<<30 | b29<<29 | b28<<28 | b27<<27 | b26<<26 | b23<<23 | b22<<22)
#define HW_REVID_MASK	HW_REVID(1, 1, 1, 1, 1, 1, 1)

/* directly indexed by chip_t, above */
const static struct {
	const char *name;
	u32 version; /* from RTL8139C/RTL8139D docs */
	u32 flags;
} rtl_chip_info[] = {
	{ "RTL-8139",
	  HW_REVID(1, 0, 0, 0, 0, 0, 0),
	  HasHltClk,
	},

	{ "RTL-8139 rev K",
	  HW_REVID(1, 1, 0, 0, 0, 0, 0),
	  HasHltClk,
	},

	{ "RTL-8139A",
	  HW_REVID(1, 1, 1, 0, 0, 0, 0),
	  HasHltClk, /* XXX undocumented? */
	},

	{ "RTL-8139A rev G",
	  HW_REVID(1, 1, 1, 0, 0, 1, 0),
	  HasHltClk, /* XXX undocumented? */
	},

	{ "RTL-8139B",
	  HW_REVID(1, 1, 1, 1, 0, 0, 0),
	  HasLWake,
	},

	{ "RTL-8130",
	  HW_REVID(1, 1, 1, 1, 1, 0, 0),
	  HasLWake,
	},

	{ "RTL-8139C",
	  HW_REVID(1, 1, 1, 0, 1, 0, 0),
	  HasLWake,
	},

	{ "RTL-8100",
	  HW_REVID(1, 1, 1, 1, 0, 1, 0),
 	  HasLWake,
 	},

	{ "RTL-8100B/8139D",
	  HW_REVID(1, 1, 1, 0, 1, 0, 1),
	  HasHltClk /* XXX undocumented? */
	| HasLWake,
	},

	{ "RTL-8101",
	  HW_REVID(1, 1, 1, 0, 1, 1, 1),
	  HasLWake,
	},
};

struct rtl_extra_stats {
	unsigned long early_rx;
	unsigned long tx_buf_mapped;
	unsigned long tx_timeouts;
	unsigned long rx_lost_in_ring;
};

struct rtl8139_private {
	void __iomem *mmio_addr;
	int drv_flags;
	struct pci_dev *pci_dev;
	u32 msg_enable;
	struct net_device_stats stats;
	unsigned char *rx_ring;
	unsigned int cur_rx;	/* Index into the Rx buffer of next Rx pkt. */
	unsigned int tx_flag;
	unsigned long cur_tx;
	unsigned long dirty_tx;
	unsigned char *tx_buf[NUM_TX_DESC];	/* Tx bounce buffers */
	unsigned char *tx_bufs;	/* Tx bounce buffer region. */
	dma_addr_t rx_ring_dma;
	dma_addr_t tx_bufs_dma;
	signed char phys[4];		/* MII device addresses. */
	char twistie, twist_row, twist_col;	/* Twister tune state. */
	unsigned int default_port : 4;	/* Last dev->if_port value. */
	unsigned int have_thread : 1;
	spinlock_t lock;
	spinlock_t rx_lock;
	chip_t chipset;
	u32 rx_config;
	struct rtl_extra_stats xstats;

	struct work_struct thread;

	struct mii_if_info mii;
	unsigned int regs_len;
	unsigned long fifo_copy_timeout;
};

MODULE_AUTHOR ("Jeff Garzik <jgarzik@pobox.com>");
MODULE_DESCRIPTION ("RealTek RTL-8139 Fast Ethernet driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

module_param(multicast_filter_limit, int, 0);
module_param_array(media, int, NULL, 0);
module_param_array(full_duplex, int, NULL, 0);
module_param(debug, int, 0);
MODULE_PARM_DESC (debug, "8139too bitmapped message enable number");
MODULE_PARM_DESC (multicast_filter_limit, "8139too maximum number of filtered multicast addresses");
MODULE_PARM_DESC (media, "8139too: Bits 4+9: force full duplex, bit 5: 100Mbps");
MODULE_PARM_DESC (full_duplex, "8139too: Force full duplex for board(s) (1)");

static int read_eeprom (void __iomem *ioaddr, int location, int addr_len);
static int rtl8139_open (struct net_device *dev);
static int mdio_read (struct net_device *dev, int phy_id, int location);
static void mdio_write (struct net_device *dev, int phy_id, int location,
			int val);
static void rtl8139_start_thread(struct rtl8139_private *tp);
static void rtl8139_tx_timeout (struct net_device *dev);
static void rtl8139_init_ring (struct net_device *dev);
static int rtl8139_start_xmit (struct sk_buff *skb,
			       struct net_device *dev);
static int rtl8139_poll(struct net_device *dev, int *budget);
#ifdef CONFIG_NET_POLL_CONTROLLER
static void rtl8139_poll_controller(struct net_device *dev);
#endif
static irqreturn_t rtl8139_interrupt (int irq, void *dev_instance,
			       struct pt_regs *regs);
static int rtl8139_close (struct net_device *dev);
static int netdev_ioctl (struct net_device *dev, struct ifreq *rq, int cmd);
static struct net_device_stats *rtl8139_get_stats (struct net_device *dev);
static void rtl8139_set_rx_mode (struct net_device *dev);
static void __set_rx_mode (struct net_device *dev);
static void rtl8139_hw_start (struct net_device *dev);
static void rtl8139_thread (void *_data);
static struct ethtool_ops rtl8139_ethtool_ops;

/* write MMIO register, with flush */
/* Flush avoids rtl8139 bug w/ posted MMIO writes */
#define RTL_W8_F(reg, val8)	do { iowrite8 ((val8), ioaddr + (reg)); ioread8 (ioaddr + (reg)); } while (0)
#define RTL_W16_F(reg, val16)	do { iowrite16 ((val16), ioaddr + (reg)); ioread16 (ioaddr + (reg)); } while (0)
#define RTL_W32_F(reg, val32)	do { iowrite32 ((val32), ioaddr + (reg)); ioread32 (ioaddr + (reg)); } while (0)


#define MMIO_FLUSH_AUDIT_COMPLETE 1
#if MMIO_FLUSH_AUDIT_COMPLETE

/* write MMIO register */
#define RTL_W8(reg, val8)	iowrite8 ((val8), ioaddr + (reg))
#define RTL_W16(reg, val16)	iowrite16 ((val16), ioaddr + (reg))
#define RTL_W32(reg, val32)	iowrite32 ((val32), ioaddr + (reg))

#else

/* write MMIO register, then flush */
#define RTL_W8		RTL_W8_F
#define RTL_W16		RTL_W16_F
#define RTL_W32		RTL_W32_F

#endif /* MMIO_FLUSH_AUDIT_COMPLETE */

/* read MMIO register */
#define RTL_R8(reg)		ioread8 (ioaddr + (reg))
#define RTL_R16(reg)		ioread16 (ioaddr + (reg))
#define RTL_R32(reg)		((unsigned long) ioread32 (ioaddr + (reg)))


static const u16 rtl8139_intr_mask =
	PCIErr | PCSTimeout | RxUnderrun | RxOverflow | RxFIFOOver |
	TxErr | TxOK | RxErr | RxOK;

static const u16 rtl8139_norx_intr_mask =
	PCIErr | PCSTimeout | RxUnderrun |
	TxErr | TxOK | RxErr ;

#if RX_BUF_IDX == 0
static const unsigned int rtl8139_rx_config =
	RxCfgRcv8K | RxNoWrap |
	(RX_FIFO_THRESH << RxCfgFIFOShift) |
	(RX_DMA_BURST << RxCfgDMAShift);
#elif RX_BUF_IDX == 1
static const unsigned int rtl8139_rx_config =
	RxCfgRcv16K | RxNoWrap |
	(RX_FIFO_THRESH << RxCfgFIFOShift) |
	(RX_DMA_BURST << RxCfgDMAShift);
#elif RX_BUF_IDX == 2
static const unsigned int rtl8139_rx_config =
	RxCfgRcv32K | RxNoWrap |
	(RX_FIFO_THRESH << RxCfgFIFOShift) |
	(RX_DMA_BURST << RxCfgDMAShift);
#elif RX_BUF_IDX == 3
static const unsigned int rtl8139_rx_config =
	RxCfgRcv64K |
	(RX_FIFO_THRESH << RxCfgFIFOShift) |
	(RX_DMA_BURST << RxCfgDMAShift);
#else
#error "Invalid configuration for 8139_RXBUF_IDX"
#endif

static const unsigned int rtl8139_tx_config =
	TxIFG96 | (TX_DMA_BURST << TxDMAShift) | (TX_RETRY << TxRetryShift);

static void __rtl8139_cleanup_dev (struct net_device *dev)
{
	struct rtl8139_private *tp = netdev_priv(dev);
	struct pci_dev *pdev;

	assert (dev != NULL);
	assert (tp->pci_dev != NULL);
	pdev = tp->pci_dev;

#ifdef USE_IO_OPS
	if (tp->mmio_addr)
		ioport_unmap (tp->mmio_addr);
#else
	if (tp->mmio_addr)
		pci_iounmap (pdev, tp->mmio_addr);
#endif /* USE_IO_OPS */

	/* it's ok to call this even if we have no regions to free */
	pci_release_regions (pdev);

	free_netdev(dev);
	pci_set_drvdata (pdev, NULL);
}


static void rtl8139_chip_reset (void __iomem *ioaddr)
{
	int i;

	/* Soft reset the chip. */
	RTL_W8 (ChipCmd, CmdReset);

	/* Check that the chip has finished the reset. */
	for (i = 1000; i > 0; i--) {
		barrier();
		if ((RTL_R8 (ChipCmd) & CmdReset) == 0)
			break;
		udelay (10);
	}
}


static int __devinit rtl8139_init_board (struct pci_dev *pdev,
					 struct net_device **dev_out)
{
	void __iomem *ioaddr;
	struct net_device *dev;
	struct rtl8139_private *tp;
	u8 tmp8;
	int rc, disable_dev_on_err = 0;
	unsigned int i;
	unsigned long pio_start, pio_end, pio_flags, pio_len;
	unsigned long mmio_start, mmio_end, mmio_flags, mmio_len;
	u32 version;

	assert (pdev != NULL);

	*dev_out = NULL;

	/* dev and priv zeroed in alloc_etherdev */
	dev = alloc_etherdev (sizeof (*tp));
	if (dev == NULL) {
		printk (KERN_ERR PFX "%s: Unable to alloc new net device\n", pci_name(pdev));
		return -ENOMEM;
	}
	SET_MODULE_OWNER(dev);
	SET_NETDEV_DEV(dev, &pdev->dev);

	tp = netdev_priv(dev);
	tp->pci_dev = pdev;

	/* enable device (incl. PCI PM wakeup and hotplug setup) */
	rc = pci_enable_device (pdev);
	if (rc)
		goto err_out;

	pio_start = pci_resource_start (pdev, 0);
	pio_end = pci_resource_end (pdev, 0);
	pio_flags = pci_resource_flags (pdev, 0);
	pio_len = pci_resource_len (pdev, 0);

	mmio_start = pci_resource_start (pdev, 1);
	mmio_end = pci_resource_end (pdev, 1);
	mmio_flags = pci_resource_flags (pdev, 1);
	mmio_len = pci_resource_len (pdev, 1);

	/* set this immediately, we need to know before
	 * we talk to the chip directly */
	DPRINTK("PIO region size == 0x%02X\n", pio_len);
	DPRINTK("MMIO region size == 0x%02lX\n", mmio_len);

#ifdef USE_IO_OPS
	/* make sure PCI base addr 0 is PIO */
	if (!(pio_flags & IORESOURCE_IO)) {
		printk (KERN_ERR PFX "%s: region #0 not a PIO resource, aborting\n", pci_name(pdev));
		rc = -ENODEV;
		goto err_out;
	}
	/* check for weird/broken PCI region reporting */
	if (pio_len < RTL_MIN_IO_SIZE) {
		printk (KERN_ERR PFX "%s: Invalid PCI I/O region size(s), aborting\n", pci_name(pdev));
		rc = -ENODEV;
		goto err_out;
	}
#else
	/* make sure PCI base addr 1 is MMIO */
	if (!(mmio_flags & IORESOURCE_MEM)) {
		printk (KERN_ERR PFX "%s: region #1 not an MMIO resource, aborting\n", pci_name(pdev));
		rc = -ENODEV;
		goto err_out;
	}
	if (mmio_len < RTL_MIN_IO_SIZE) {
		printk (KERN_ERR PFX "%s: Invalid PCI mem region size(s), aborting\n", pci_name(pdev));
		rc = -ENODEV;
		goto err_out;
	}
#endif

	rc = pci_request_regions (pdev, "8139too");
	if (rc)
		goto err_out;
	disable_dev_on_err = 1;

	/* enable PCI bus-mastering */
	pci_set_master (pdev);

#ifdef USE_IO_OPS
	ioaddr = ioport_map(pio_start, pio_len);
	if (!ioaddr) {
		printk (KERN_ERR PFX "%s: cannot map PIO, aborting\n", pci_name(pdev));
		rc = -EIO;
		goto err_out;
	}
	dev->base_addr = pio_start;
	tp->mmio_addr = ioaddr;
	tp->regs_len = pio_len;
#else
	/* ioremap MMIO region */
	ioaddr = pci_iomap(pdev, 1, 0);
	if (ioaddr == NULL) {
		printk (KERN_ERR PFX "%s: cannot remap MMIO, aborting\n", pci_name(pdev));
		rc = -EIO;
		goto err_out;
	}
	dev->base_addr = (long) ioaddr;
	tp->mmio_addr = ioaddr;
	tp->regs_len = mmio_len;
#endif /* USE_IO_OPS */

	/* Bring old chips out of low-power mode. */
	RTL_W8 (HltClk, 'R');

	/* check for missing/broken hardware */
	if (RTL_R32 (TxConfig) == 0xFFFFFFFF) {
		printk (KERN_ERR PFX "%s: Chip not responding, ignoring board\n",
			pci_name(pdev));
		rc = -EIO;
		goto err_out;
	}

	/* identify chip attached to board */
	version = RTL_R32 (TxConfig) & HW_REVID_MASK;
	for (i = 0; i < ARRAY_SIZE (rtl_chip_info); i++)
		if (version == rtl_chip_info[i].version) {
			tp->chipset = i;
			goto match;
		}

	/* if unknown chip, assume array element #0, original RTL-8139 in this case */
	printk (KERN_DEBUG PFX "%s: unknown chip version, assuming RTL-8139\n",
		pci_name(pdev));
	printk (KERN_DEBUG PFX "%s: TxConfig = 0x%lx\n", pci_name(pdev), RTL_R32 (TxConfig));
	tp->chipset = 0;

match:
	DPRINTK ("chipset id (%d) == index %d, '%s'\n",
		 version, i, rtl_chip_info[i].name);

	if (tp->chipset >= CH_8139B) {
		u8 new_tmp8 = tmp8 = RTL_R8 (Config1);
		DPRINTK("PCI PM wakeup\n");
		if ((rtl_chip_info[tp->chipset].flags & HasLWake) &&
		    (tmp8 & LWAKE))
			new_tmp8 &= ~LWAKE;
		new_tmp8 |= Cfg1_PM_Enable;
		if (new_tmp8 != tmp8) {
			RTL_W8 (Cfg9346, Cfg9346_Unlock);
			RTL_W8 (Config1, tmp8);
			RTL_W8 (Cfg9346, Cfg9346_Lock);
		}
		if (rtl_chip_info[tp->chipset].flags & HasLWake) {
			tmp8 = RTL_R8 (Config4);
			if (tmp8 & LWPTN) {
				RTL_W8 (Cfg9346, Cfg9346_Unlock);
				RTL_W8 (Config4, tmp8 & ~LWPTN);
				RTL_W8 (Cfg9346, Cfg9346_Lock);
			}
		}
	} else {
		DPRINTK("Old chip wakeup\n");
		tmp8 = RTL_R8 (Config1);
		tmp8 &= ~(SLEEP | PWRDN);
		RTL_W8 (Config1, tmp8);
	}

	rtl8139_chip_reset (ioaddr);

	*dev_out = dev;
	return 0;

err_out:
	__rtl8139_cleanup_dev (dev);
	if (disable_dev_on_err)
		pci_disable_device (pdev);
	return rc;
}


static int __devinit rtl8139_init_one (struct pci_dev *pdev,
				       const struct pci_device_id *ent)
{
	struct net_device *dev = NULL;
	struct rtl8139_private *tp;
	int i, addr_len, option;
	void __iomem *ioaddr;
	static int board_idx = -1;
	u8 pci_rev;

	assert (pdev != NULL);
	assert (ent != NULL);

	board_idx++;

	/* when we're built into the kernel, the driver version message
	 * is only printed if at least one 8139 board has been found
	 */
#ifndef MODULE
	{
		static int printed_version;
		if (!printed_version++)
			printk (KERN_INFO RTL8139_DRIVER_NAME "\n");
	}
#endif

	pci_read_config_byte(pdev, PCI_REVISION_ID, &pci_rev);

	if (pdev->vendor == PCI_VENDOR_ID_REALTEK &&
	    pdev->device == PCI_DEVICE_ID_REALTEK_8139 && pci_rev >= 0x20) {
		printk(KERN_INFO PFX "pci dev %s (id %04x:%04x rev %02x) is an enhanced 8139C+ chip\n",
		       pci_name(pdev), pdev->vendor, pdev->device, pci_rev);
		printk(KERN_INFO PFX "Use the \"8139cp\" driver for improved performance and stability.\n");
	}

	i = rtl8139_init_board (pdev, &dev);
	if (i < 0)
		return i;

	assert (dev != NULL);
	tp = netdev_priv(dev);

	ioaddr = tp->mmio_addr;
	assert (ioaddr != NULL);

	addr_len = read_eeprom (ioaddr, 0, 8) == 0x8129 ? 8 : 6;
	for (i = 0; i < 3; i++)
		((u16 *) (dev->dev_addr))[i] =
		    le16_to_cpu (read_eeprom (ioaddr, i + 7, addr_len));
	memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);

	/* The Rtl8139-specific entries in the device structure. */
	dev->open = rtl8139_open;
	dev->hard_start_xmit = rtl8139_start_xmit;
	dev->poll = rtl8139_poll;
	dev->weight = 64;
	dev->stop = rtl8139_close;
	dev->get_stats = rtl8139_get_stats;
	dev->set_multicast_list = rtl8139_set_rx_mode;
	dev->do_ioctl = netdev_ioctl;
	dev->ethtool_ops = &rtl8139_ethtool_ops;
	dev->tx_timeout = rtl8139_tx_timeout;
	dev->watchdog_timeo = TX_TIMEOUT;
#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = rtl8139_poll_controller;
#endif

	/* note: the hardware is not capable of sg/csum/highdma, however
	 * through the use of skb_copy_and_csum_dev we enable these
	 * features
	 */
	dev->features |= NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA;

	dev->irq = pdev->irq;