1/* epic100.c: A SMC 83c170 EPIC/100 Fast Ethernet driver for Linux. */
   2/*
   3	Written/copyright 1997-2001 by Donald Becker.
   4
   5	This software may be used and distributed according to the terms of
   6	the GNU General Public License (GPL), incorporated herein by reference.
   7	Drivers based on or derived from this code fall under the GPL and must
   8	retain the authorship, copyright and license notice.  This file is not
   9	a complete program and may only be used when the entire operating
  10	system is licensed under the GPL.
  11
  12	This driver is for the SMC83c170/175 "EPIC" series, as used on the
  13	SMC EtherPower II 9432 PCI adapter, and several CardBus cards.
  14
  15	The author may be reached as becker@scyld.com, or C/O
  16	Scyld Computing Corporation
  17	410 Severn Ave., Suite 210
  18	Annapolis MD 21403
  19
  20	Information and updates available at
  21	http://www.scyld.com/network/epic100.html
  22	[this link no longer provides anything useful -jgarzik]
  23
  24	---------------------------------------------------------------------
  25
  26*/
  27
  28#define DRV_NAME        "epic100"
  29#define DRV_VERSION     "2.1"
  30#define DRV_RELDATE     "Sept 11, 2006"
  31
  32/* The user-configurable values.
  33   These may be modified when a driver module is loaded.*/
  34
  35static int debug = 1;			/* 1 normal messages, 0 quiet .. 7 verbose. */
  36
  37/* Used to pass the full-duplex flag, etc. */
  38#define MAX_UNITS 8		/* More are supported, limit only on options */
  39static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
  40static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};
  41
  42/* Set the copy breakpoint for the copy-only-tiny-frames scheme.
  43   Setting to > 1518 effectively disables this feature. */
  44static int rx_copybreak;
  45
  46/* Operational parameters that are set at compile time. */
  47
  48/* Keep the ring sizes a power of two for operational efficiency.
  49   The compiler will convert <unsigned>'%'<2^N> into a bit mask.
  50   Making the Tx ring too large decreases the effectiveness of channel
  51   bonding and packet priority.
  52   There are no ill effects from too-large receive rings. */
  53#define TX_RING_SIZE	256
  54#define TX_QUEUE_LEN	240		/* Limit ring entries actually used.  */
  55#define RX_RING_SIZE	256
  56#define TX_TOTAL_SIZE	TX_RING_SIZE*sizeof(struct epic_tx_desc)
  57#define RX_TOTAL_SIZE	RX_RING_SIZE*sizeof(struct epic_rx_desc)
  58
  59/* Operational parameters that usually are not changed. */
  60/* Time in jiffies before concluding the transmitter is hung. */
  61#define TX_TIMEOUT  (2*HZ)
  62
  63#define PKT_BUF_SZ		1536			/* Size of each temporary Rx buffer.*/
  64
  65/* Bytes transferred to chip before transmission starts. */
  66/* Initial threshold, increased on underflow, rounded down to 4 byte units. */
  67#define TX_FIFO_THRESH 256
  68#define RX_FIFO_THRESH 1		/* 0-3, 0==32, 64,96, or 3==128 bytes  */
  69
  70#include <linux/module.h>
  71#include <linux/kernel.h>
  72#include <linux/string.h>
  73#include <linux/timer.h>
  74#include <linux/errno.h>
  75#include <linux/ioport.h>
  76#include <linux/interrupt.h>
  77#include <linux/pci.h>
  78#include <linux/delay.h>
  79#include <linux/netdevice.h>
  80#include <linux/etherdevice.h>
  81#include <linux/skbuff.h>
  82#include <linux/init.h>
  83#include <linux/spinlock.h>
  84#include <linux/ethtool.h>
  85#include <linux/mii.h>
  86#include <linux/crc32.h>
  87#include <linux/bitops.h>
  88#include <asm/io.h>
  89#include <linux/uaccess.h>
  90#include <asm/byteorder.h>
  91
  92/* These identify the driver base version and may not be removed. */
  93static char version[] =
  94DRV_NAME ".c:v1.11 1/7/2001 Written by Donald Becker <becker@scyld.com>";
  95static char version2[] =
  96"  (unofficial 2.4.x kernel port, version " DRV_VERSION ", " DRV_RELDATE ")";
  97
  98MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
  99MODULE_DESCRIPTION("SMC 83c170 EPIC series Ethernet driver");
 100MODULE_LICENSE("GPL");
 101
 102module_param(debug, int, 0);
 103module_param(rx_copybreak, int, 0);
 104module_param_array(options, int, NULL, 0);
 105module_param_array(full_duplex, int, NULL, 0);
 106MODULE_PARM_DESC(debug, "EPIC/100 debug level (0-5)");
 107MODULE_PARM_DESC(options, "EPIC/100: Bits 0-3: media type, bit 4: full duplex");
 108MODULE_PARM_DESC(rx_copybreak, "EPIC/100 copy breakpoint for copy-only-tiny-frames");
 109MODULE_PARM_DESC(full_duplex, "EPIC/100 full duplex setting(s) (1)");
 110
 111/*
 112				Theory of Operation
 113
 114I. Board Compatibility
 115
 116This device driver is designed for the SMC "EPIC/100", the SMC
 117single-chip Ethernet controllers for PCI.  This chip is used on
 118the SMC EtherPower II boards.
 119
 120II. Board-specific settings
 121
 122PCI bus devices are configured by the system at boot time, so no jumpers
 123need to be set on the board.  The system BIOS will assign the
 124PCI INTA signal to a (preferably otherwise unused) system IRQ line.
 125Note: Kernel versions earlier than 1.3.73 do not support shared PCI
 126interrupt lines.
 127
 128III. Driver operation
 129
 130IIIa. Ring buffers
 131
 132IVb. References
 133
 134http://www.smsc.com/media/Downloads_Public/discontinued/83c171.pdf
 135http://www.smsc.com/media/Downloads_Public/discontinued/83c175.pdf
 136http://scyld.com/expert/NWay.html
 137http://www.national.com/pf/DP/DP83840A.html
 138
 139IVc. Errata
 140
 141*/
 142
 143
 144enum chip_capability_flags { MII_PWRDWN=1, TYPE2_INTR=2, NO_MII=4 };
 145
 146#define EPIC_TOTAL_SIZE 0x100
 147#define USE_IO_OPS 1
 148
 149#ifdef USE_IO_OPS
 150#define EPIC_BAR	0
 151#else
 152#define EPIC_BAR	1
 153#endif
 154
 155typedef enum {
 156	SMSC_83C170_0,
 157	SMSC_83C170,
 158	SMSC_83C175,
 159} chip_t;
 160
 161
 162struct epic_chip_info {
 163	const char *name;
 164        int drv_flags;                          /* Driver use, intended as capability flags. */
 165};
 166
 167
 168/* indexed by chip_t */
 169static const struct epic_chip_info pci_id_tbl[] = {
 170	{ "SMSC EPIC/100 83c170",	TYPE2_INTR | NO_MII | MII_PWRDWN },
 171	{ "SMSC EPIC/100 83c170",	TYPE2_INTR },
 172	{ "SMSC EPIC/C 83c175",		TYPE2_INTR | MII_PWRDWN },
 173};
 174
 175
 176static const struct pci_device_id epic_pci_tbl[] = {
 177	{ 0x10B8, 0x0005, 0x1092, 0x0AB4, 0, 0, SMSC_83C170_0 },
 178	{ 0x10B8, 0x0005, PCI_ANY_ID, PCI_ANY_ID, 0, 0, SMSC_83C170 },
 179	{ 0x10B8, 0x0006, PCI_ANY_ID, PCI_ANY_ID,
 180	  PCI_CLASS_NETWORK_ETHERNET << 8, 0xffff00, SMSC_83C175 },
 181	{ 0,}
 182};
 183MODULE_DEVICE_TABLE (pci, epic_pci_tbl);
 184
 185#define ew16(reg, val)	iowrite16(val, ioaddr + (reg))
 186#define ew32(reg, val)	iowrite32(val, ioaddr + (reg))
 187#define er8(reg)	ioread8(ioaddr + (reg))
 188#define er16(reg)	ioread16(ioaddr + (reg))
 189#define er32(reg)	ioread32(ioaddr + (reg))
 190
 191/* Offsets to registers, using the (ugh) SMC names. */
 192enum epic_registers {
 193  COMMAND=0, INTSTAT=4, INTMASK=8, GENCTL=0x0C, NVCTL=0x10, EECTL=0x14,
 194  PCIBurstCnt=0x18,
 195  TEST1=0x1C, CRCCNT=0x20, ALICNT=0x24, MPCNT=0x28,	/* Rx error counters. */
 196  MIICtrl=0x30, MIIData=0x34, MIICfg=0x38,
 197  LAN0=64,						/* MAC address. */
 198  MC0=80,						/* Multicast filter table. */
 199  RxCtrl=96, TxCtrl=112, TxSTAT=0x74,
 200  PRxCDAR=0x84, RxSTAT=0xA4, EarlyRx=0xB0, PTxCDAR=0xC4, TxThresh=0xDC,
 201};
 202
 203/* Interrupt register bits, using my own meaningful names. */
 204enum IntrStatus {
 205	TxIdle=0x40000, RxIdle=0x20000, IntrSummary=0x010000,
 206	PCIBusErr170=0x7000, PCIBusErr175=0x1000, PhyEvent175=0x8000,
 207	RxStarted=0x0800, RxEarlyWarn=0x0400, CntFull=0x0200, TxUnderrun=0x0100,
 208	TxEmpty=0x0080, TxDone=0x0020, RxError=0x0010,
 209	RxOverflow=0x0008, RxFull=0x0004, RxHeader=0x0002, RxDone=0x0001,
 210};
 211enum CommandBits {
 212	StopRx=1, StartRx=2, TxQueued=4, RxQueued=8,
 213	StopTxDMA=0x20, StopRxDMA=0x40, RestartTx=0x80,
 214};
 215
 216#define EpicRemoved	0xffffffff	/* Chip failed or removed (CardBus) */
 217
 218#define EpicNapiEvent	(TxEmpty | TxDone | \
 219			 RxDone | RxStarted | RxEarlyWarn | RxOverflow | RxFull)
 220#define EpicNormalEvent	(0x0000ffff & ~EpicNapiEvent)
 221
 222static const u16 media2miictl[16] = {
 223	0, 0x0C00, 0x0C00, 0x2000,  0x0100, 0x2100, 0, 0,
 224	0, 0, 0, 0,  0, 0, 0, 0 };
 225
 226/*
 227 * The EPIC100 Rx and Tx buffer descriptors.  Note that these
 228 * really ARE host-endian; it's not a misannotation.  We tell
 229 * the card to byteswap them internally on big-endian hosts -
 230 * look for #ifdef __BIG_ENDIAN in epic_open().
 231 */
 232
 233struct epic_tx_desc {
 234	u32 txstatus;
 235	u32 bufaddr;
 236	u32 buflength;
 237	u32 next;
 238};
 239
 240struct epic_rx_desc {
 241	u32 rxstatus;
 242	u32 bufaddr;
 243	u32 buflength;
 244	u32 next;
 245};
 246
 247enum desc_status_bits {
 248	DescOwn=0x8000,
 249};
 250
 251#define PRIV_ALIGN	15 	/* Required alignment mask */
 252struct epic_private {
 253	struct epic_rx_desc *rx_ring;
 254	struct epic_tx_desc *tx_ring;
 255	/* The saved address of a sent-in-place packet/buffer, for skfree(). */
 256	struct sk_buff* tx_skbuff[TX_RING_SIZE];
 257	/* The addresses of receive-in-place skbuffs. */
 258	struct sk_buff* rx_skbuff[RX_RING_SIZE];
 259
 260	dma_addr_t tx_ring_dma;
 261	dma_addr_t rx_ring_dma;
 262
 263	/* Ring pointers. */
 264	spinlock_t lock;				/* Group with Tx control cache line. */
 265	spinlock_t napi_lock;
 266	struct napi_struct napi;
 267	unsigned int cur_tx, dirty_tx;
 268
 269	unsigned int cur_rx, dirty_rx;
 270	u32 irq_mask;
 271	unsigned int rx_buf_sz;				/* Based on MTU+slack. */
 272
 273	void __iomem *ioaddr;
 274	struct pci_dev *pci_dev;			/* PCI bus location. */
 275	int chip_id, chip_flags;
 276
 277	struct timer_list timer;			/* Media selection timer. */
 278	int tx_threshold;
 279	unsigned char mc_filter[8];
 280	signed char phys[4];				/* MII device addresses. */
 281	u16 advertising;					/* NWay media advertisement */
 282	int mii_phy_cnt;
 283	u32 ethtool_ops_nesting;
 284	struct mii_if_info mii;
 285	unsigned int tx_full:1;				/* The Tx queue is full. */
 286	unsigned int default_port:4;		/* Last dev->if_port value. */
 287};
 288
 289static int epic_open(struct net_device *dev);
 290static int read_eeprom(struct epic_private *, int);
 291static int mdio_read(struct net_device *dev, int phy_id, int location);
 292static void mdio_write(struct net_device *dev, int phy_id, int loc, int val);
 293static void epic_restart(struct net_device *dev);
 294static void epic_timer(struct timer_list *t);
 295static void epic_tx_timeout(struct net_device *dev, unsigned int txqueue);
 296static void epic_init_ring(struct net_device *dev);
 297static netdev_tx_t epic_start_xmit(struct sk_buff *skb,
 298				   struct net_device *dev);
 299static int epic_rx(struct net_device *dev, int budget);
 300static int epic_poll(struct napi_struct *napi, int budget);
 301static irqreturn_t epic_interrupt(int irq, void *dev_instance);
 302static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 303static const struct ethtool_ops netdev_ethtool_ops;
 304static int epic_close(struct net_device *dev);
 305static struct net_device_stats *epic_get_stats(struct net_device *dev);
 306static void set_rx_mode(struct net_device *dev);
 307
 308static const struct net_device_ops epic_netdev_ops = {
 309	.ndo_open		= epic_open,
 310	.ndo_stop		= epic_close,
 311	.ndo_start_xmit		= epic_start_xmit,
 312	.ndo_tx_timeout 	= epic_tx_timeout,
 313	.ndo_get_stats		= epic_get_stats,
 314	.ndo_set_rx_mode	= set_rx_mode,
 315	.ndo_eth_ioctl		= netdev_ioctl,
 316	.ndo_set_mac_address 	= eth_mac_addr,
 317	.ndo_validate_addr	= eth_validate_addr,
 318};
 319
 320static int epic_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 321{
 322	static int card_idx = -1;
 323	void __iomem *ioaddr;
 324	int chip_idx = (int) ent->driver_data;
 325	struct net_device *dev;
 326	struct epic_private *ep;
 327	int i, ret, option = 0, duplex = 0;
 328	__le16 addr[ETH_ALEN / 2];
 329	void *ring_space;
 330	dma_addr_t ring_dma;
 331
 332/* when built into the kernel, we only print version if device is found */
 333#ifndef MODULE
 334	pr_info_once("%s%s\n", version, version2);
 335#endif
 336
 337	card_idx++;
 338
 339	ret = pci_enable_device(pdev);
 340	if (ret)
 341		goto out;
 342
 343	if (pci_resource_len(pdev, 0) < EPIC_TOTAL_SIZE) {
 344		dev_err(&pdev->dev, "no PCI region space\n");
 345		ret = -ENODEV;
 346		goto err_out_disable;
 347	}
 348
 349	pci_set_master(pdev);
 350
 351	ret = pci_request_regions(pdev, DRV_NAME);
 352	if (ret < 0)
 353		goto err_out_disable;
 354
 355	ret = -ENOMEM;
 356
 357	dev = alloc_etherdev(sizeof (*ep));
 358	if (!dev)
 359		goto err_out_free_res;
 360
 361	SET_NETDEV_DEV(dev, &pdev->dev);
 362
 363	ioaddr = pci_iomap(pdev, EPIC_BAR, 0);
 364	if (!ioaddr) {
 365		dev_err(&pdev->dev, "ioremap failed\n");
 366		goto err_out_free_netdev;
 367	}
 368
 369	pci_set_drvdata(pdev, dev);
 370	ep = netdev_priv(dev);
 371	ep->ioaddr = ioaddr;
 372	ep->mii.dev = dev;
 373	ep->mii.mdio_read = mdio_read;
 374	ep->mii.mdio_write = mdio_write;
 375	ep->mii.phy_id_mask = 0x1f;
 376	ep->mii.reg_num_mask = 0x1f;
 377
 378	ring_space = dma_alloc_coherent(&pdev->dev, TX_TOTAL_SIZE, &ring_dma,
 379					GFP_KERNEL);
 380	if (!ring_space)
 381		goto err_out_iounmap;
 382	ep->tx_ring = ring_space;
 383	ep->tx_ring_dma = ring_dma;
 384
 385	ring_space = dma_alloc_coherent(&pdev->dev, RX_TOTAL_SIZE, &ring_dma,
 386					GFP_KERNEL);
 387	if (!ring_space)
 388		goto err_out_unmap_tx;
 389	ep->rx_ring = ring_space;
 390	ep->rx_ring_dma = ring_dma;
 391
 392	if (dev->mem_start) {
 393		option = dev->mem_start;
 394		duplex = (dev->mem_start & 16) ? 1 : 0;
 395	} else if (card_idx >= 0  &&  card_idx < MAX_UNITS) {
 396		if (options[card_idx] >= 0)
 397			option = options[card_idx];
 398		if (full_duplex[card_idx] >= 0)
 399			duplex = full_duplex[card_idx];
 400	}
 401
 402	spin_lock_init(&ep->lock);
 403	spin_lock_init(&ep->napi_lock);
 404
 405	/* Bring the chip out of low-power mode. */
 406	ew32(GENCTL, 0x4200);
 407	/* Magic?!  If we don't set this bit the MII interface won't work. */
 408	/* This magic is documented in SMSC app note 7.15 */
 409	for (i = 16; i > 0; i--)
 410		ew32(TEST1, 0x0008);
 411
 412	/* Turn on the MII transceiver. */
 413	ew32(MIICfg, 0x12);
 414	if (chip_idx == 1)
 415		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
 416	ew32(GENCTL, 0x0200);
 417
 418	/* Note: the '175 does not have a serial EEPROM. */
 419	for (i = 0; i < 3; i++)
 420		addr[i] = cpu_to_le16(er16(LAN0 + i*4));
 421	eth_hw_addr_set(dev, (u8 *)addr);
 422
 423	if (debug > 2) {
 424		dev_dbg(&pdev->dev, "EEPROM contents:\n");
 425		for (i = 0; i < 64; i++)
 426			pr_cont(" %4.4x%s", read_eeprom(ep, i),
 427				   i % 16 == 15 ? "\n" : "");
 428	}
 429
 430	ep->pci_dev = pdev;
 431	ep->chip_id = chip_idx;
 432	ep->chip_flags = pci_id_tbl[chip_idx].drv_flags;
 433	ep->irq_mask =
 434		(ep->chip_flags & TYPE2_INTR ?  PCIBusErr175 : PCIBusErr170)
 435		 | CntFull | TxUnderrun | EpicNapiEvent;
 436
 437	/* Find the connected MII xcvrs.
 438	   Doing this in open() would allow detecting external xcvrs later, but
 439	   takes much time and no cards have external MII. */
 440	{
 441		int phy, phy_idx = 0;
 442		for (phy = 1; phy < 32 && phy_idx < sizeof(ep->phys); phy++) {
 443			int mii_status = mdio_read(dev, phy, MII_BMSR);
 444			if (mii_status != 0xffff  &&  mii_status != 0x0000) {
 445				ep->phys[phy_idx++] = phy;
 446				dev_info(&pdev->dev,
 447					"MII transceiver #%d control "
 448					"%4.4x status %4.4x.\n",
 449					phy, mdio_read(dev, phy, 0), mii_status);
 450			}
 451		}
 452		ep->mii_phy_cnt = phy_idx;
 453		if (phy_idx != 0) {
 454			phy = ep->phys[0];
 455			ep->mii.advertising = mdio_read(dev, phy, MII_ADVERTISE);
 456			dev_info(&pdev->dev,
 457				"Autonegotiation advertising %4.4x link "
 458				   "partner %4.4x.\n",
 459				   ep->mii.advertising, mdio_read(dev, phy, 5));
 460		} else if ( ! (ep->chip_flags & NO_MII)) {
 461			dev_warn(&pdev->dev,
 462				"***WARNING***: No MII transceiver found!\n");
 463			/* Use the known PHY address of the EPII. */
 464			ep->phys[0] = 3;
 465		}
 466		ep->mii.phy_id = ep->phys[0];
 467	}
 468
 469	/* Turn off the MII xcvr (175 only!), leave the chip in low-power mode. */
 470	if (ep->chip_flags & MII_PWRDWN)
 471		ew32(NVCTL, er32(NVCTL) & ~0x483c);
 472	ew32(GENCTL, 0x0008);
 473
 474	/* The lower four bits are the media type. */
 475	if (duplex) {
 476		ep->mii.force_media = ep->mii.full_duplex = 1;
 477		dev_info(&pdev->dev, "Forced full duplex requested.\n");
 478	}
 479	dev->if_port = ep->default_port = option;
 480
 481	/* The Epic-specific entries in the device structure. */
 482	dev->netdev_ops = &epic_netdev_ops;
 483	dev->ethtool_ops = &netdev_ethtool_ops;
 484	dev->watchdog_timeo = TX_TIMEOUT;
 485	netif_napi_add(dev, &ep->napi, epic_poll);
 486
 487	ret = register_netdev(dev);
 488	if (ret < 0)
 489		goto err_out_unmap_rx;
 490
 491	netdev_info(dev, "%s at %lx, IRQ %d, %pM\n",
 492		    pci_id_tbl[chip_idx].name,
 493		    (long)pci_resource_start(pdev, EPIC_BAR), pdev->irq,
 494		    dev->dev_addr);
 495
 496out:
 497	return ret;
 498
 499err_out_unmap_rx:
 500	dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, ep->rx_ring,
 501			  ep->rx_ring_dma);
 502err_out_unmap_tx:
 503	dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, ep->tx_ring,
 504			  ep->tx_ring_dma);
 505err_out_iounmap:
 506	pci_iounmap(pdev, ioaddr);
 507err_out_free_netdev:
 508	free_netdev(dev);
 509err_out_free_res:
 510	pci_release_regions(pdev);
 511err_out_disable:
 512	pci_disable_device(pdev);
 513	goto out;
 514}
 515
 516/* Serial EEPROM section. */
 517
 518/*  EEPROM_Ctrl bits. */
 519#define EE_SHIFT_CLK	0x04	/* EEPROM shift clock. */
 520#define EE_CS			0x02	/* EEPROM chip select. */
 521#define EE_DATA_WRITE	0x08	/* EEPROM chip data in. */
 522#define EE_WRITE_0		0x01
 523#define EE_WRITE_1		0x09
 524#define EE_DATA_READ	0x10	/* EEPROM chip data out. */
 525#define EE_ENB			(0x0001 | EE_CS)
 526
 527/* Delay between EEPROM clock transitions.
 528   This serves to flush the operation to the PCI bus.
 529 */
 530
 531#define eeprom_delay()	er32(EECTL)
 532
 533/* The EEPROM commands include the alway-set leading bit. */
 534#define EE_WRITE_CMD	(5 << 6)
 535#define EE_READ64_CMD	(6 << 6)
 536#define EE_READ256_CMD	(6 << 8)
 537#define EE_ERASE_CMD	(7 << 6)
 538
 539static void epic_disable_int(struct net_device *dev, struct epic_private *ep)
 540{
 541	void __iomem *ioaddr = ep->ioaddr;
 542
 543	ew32(INTMASK, 0x00000000);
 544}
 545
 546static inline void __epic_pci_commit(void __iomem *ioaddr)
 547{
 548#ifndef USE_IO_OPS
 549	er32(INTMASK);
 550#endif
 551}
 552
 553static inline void epic_napi_irq_off(struct net_device *dev,
 554				     struct epic_private *ep)
 555{
 556	void __iomem *ioaddr = ep->ioaddr;
 557
 558	ew32(INTMASK, ep->irq_mask & ~EpicNapiEvent);
 559	__epic_pci_commit(ioaddr);
 560}
 561
 562static inline void epic_napi_irq_on(struct net_device *dev,
 563				    struct epic_private *ep)
 564{
 565	void __iomem *ioaddr = ep->ioaddr;
 566
 567	/* No need to commit possible posted write */
 568	ew32(INTMASK, ep->irq_mask | EpicNapiEvent);
 569}
 570
 571static int read_eeprom(struct epic_private *ep, int location)
 572{
 573	void __iomem *ioaddr = ep->ioaddr;
 574	int i;
 575	int retval = 0;
 576	int read_cmd = location |
 577		(er32(EECTL) & 0x40 ? EE_READ64_CMD : EE_READ256_CMD);
 578
 579	ew32(EECTL, EE_ENB & ~EE_CS);
 580	ew32(EECTL, EE_ENB);
 581
 582	/* Shift the read command bits out. */
 583	for (i = 12; i >= 0; i--) {
 584		short dataval = (read_cmd & (1 << i)) ? EE_WRITE_1 : EE_WRITE_0;
 585		ew32(EECTL, EE_ENB | dataval);
 586		eeprom_delay();
 587		ew32(EECTL, EE_ENB | dataval | EE_SHIFT_CLK);
 588		eeprom_delay();
 589	}
 590	ew32(EECTL, EE_ENB);
 591
 592	for (i = 16; i > 0; i--) {
 593		ew32(EECTL, EE_ENB | EE_SHIFT_CLK);
 594		eeprom_delay();
 595		retval = (retval << 1) | ((er32(EECTL) & EE_DATA_READ) ? 1 : 0);
 596		ew32(EECTL, EE_ENB);
 597		eeprom_delay();
 598	}
 599
 600	/* Terminate the EEPROM access. */
 601	ew32(EECTL, EE_ENB & ~EE_CS);
 602	return retval;
 603}
 604
 605#define MII_READOP		1
 606#define MII_WRITEOP		2
 607static int mdio_read(struct net_device *dev, int phy_id, int location)
 608{
 609	struct epic_private *ep = netdev_priv(dev);
 610	void __iomem *ioaddr = ep->ioaddr;
 611	int read_cmd = (phy_id << 9) | (location << 4) | MII_READOP;
 612	int i;
 613
 614	ew32(MIICtrl, read_cmd);
 615	/* Typical operation takes 25 loops. */
 616	for (i = 400; i > 0; i--) {
 617		barrier();
 618		if ((er32(MIICtrl) & MII_READOP) == 0) {
 619			/* Work around read failure bug. */
 620			if (phy_id == 1 && location < 6 &&
 621			    er16(MIIData) == 0xffff) {
 622				ew32(MIICtrl, read_cmd);
 623				continue;
 624			}
 625			return er16(MIIData);
 626		}
 627	}
 628	return 0xffff;
 629}
 630
 631static void mdio_write(struct net_device *dev, int phy_id, int loc, int value)
 632{
 633	struct epic_private *ep = netdev_priv(dev);
 634	void __iomem *ioaddr = ep->ioaddr;
 635	int i;
 636
 637	ew16(MIIData, value);
 638	ew32(MIICtrl, (phy_id << 9) | (loc << 4) | MII_WRITEOP);
 639	for (i = 10000; i > 0; i--) {
 640		barrier();
 641		if ((er32(MIICtrl) & MII_WRITEOP) == 0)
 642			break;
 643	}
 644}
 645
 646
 647static int epic_open(struct net_device *dev)
 648{
 649	struct epic_private *ep = netdev_priv(dev);
 650	void __iomem *ioaddr = ep->ioaddr;
 651	const int irq = ep->pci_dev->irq;
 652	int rc, i;
 653
 654	/* Soft reset the chip. */
 655	ew32(GENCTL, 0x4001);
 656
 657	napi_enable(&ep->napi);
 658	rc = request_irq(irq, epic_interrupt, IRQF_SHARED, dev->name, dev);
 659	if (rc) {
 660		napi_disable(&ep->napi);
 661		return rc;
 662	}
 663
 664	epic_init_ring(dev);
 665
 666	ew32(GENCTL, 0x4000);
 667	/* This magic is documented in SMSC app note 7.15 */
 668	for (i = 16; i > 0; i--)
 669		ew32(TEST1, 0x0008);
 670
 671	/* Pull the chip out of low-power mode, enable interrupts, and set for
 672	   PCI read multiple.  The MIIcfg setting and strange write order are
 673	   required by the details of which bits are reset and the transceiver
 674	   wiring on the Ositech CardBus card.
 675	*/
 676#if 0
 677	ew32(MIICfg, dev->if_port == 1 ? 0x13 : 0x12);
 678#endif
 679	if (ep->chip_flags & MII_PWRDWN)
 680		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
 681
 682	/* Tell the chip to byteswap descriptors on big-endian hosts */
 683#ifdef __BIG_ENDIAN
 684	ew32(GENCTL, 0x4432 | (RX_FIFO_THRESH << 8));
 685	er32(GENCTL);
 686	ew32(GENCTL, 0x0432 | (RX_FIFO_THRESH << 8));
 687#else
 688	ew32(GENCTL, 0x4412 | (RX_FIFO_THRESH << 8));
 689	er32(GENCTL);
 690	ew32(GENCTL, 0x0412 | (RX_FIFO_THRESH << 8));
 691#endif
 692
 693	udelay(20); /* Looks like EPII needs that if you want reliable RX init. FIXME: pci posting bug? */
 694
 695	for (i = 0; i < 3; i++)
 696		ew32(LAN0 + i*4, le16_to_cpu(((__le16*)dev->dev_addr)[i]));
 697
 698	ep->tx_threshold = TX_FIFO_THRESH;
 699	ew32(TxThresh, ep->tx_threshold);
 700
 701	if (media2miictl[dev->if_port & 15]) {
 702		if (ep->mii_phy_cnt)
 703			mdio_write(dev, ep->phys[0], MII_BMCR, media2miictl[dev->if_port&15]);
 704		if (dev->if_port == 1) {
 705			if (debug > 1)
 706				netdev_info(dev, "Using the 10base2 transceiver, MII status %4.4x.\n",
 707					    mdio_read(dev, ep->phys[0], MII_BMSR));
 708		}
 709	} else {
 710		int mii_lpa = mdio_read(dev, ep->phys[0], MII_LPA);
 711		if (mii_lpa != 0xffff) {
 712			if ((mii_lpa & LPA_100FULL) || (mii_lpa & 0x01C0) == LPA_10FULL)
 713				ep->mii.full_duplex = 1;
 714			else if (! (mii_lpa & LPA_LPACK))
 715				mdio_write(dev, ep->phys[0], MII_BMCR, BMCR_ANENABLE|BMCR_ANRESTART);
 716			if (debug > 1)
 717				netdev_info(dev, "Setting %s-duplex based on MII xcvr %d register read of %4.4x.\n",
 718					    ep->mii.full_duplex ? "full"
 719								: "half",
 720					    ep->phys[0], mii_lpa);
 721		}
 722	}
 723
 724	ew32(TxCtrl, ep->mii.full_duplex ? 0x7f : 0x79);
 725	ew32(PRxCDAR, ep->rx_ring_dma);
 726	ew32(PTxCDAR, ep->tx_ring_dma);
 727
 728	/* Start the chip's Rx process. */
 729	set_rx_mode(dev);
 730	ew32(COMMAND, StartRx | RxQueued);
 731
 732	netif_start_queue(dev);
 733
 734	/* Enable interrupts by setting the interrupt mask. */
 735	ew32(INTMASK, RxError | RxHeader | EpicNapiEvent | CntFull |
 736	     ((ep->chip_flags & TYPE2_INTR) ? PCIBusErr175 : PCIBusErr170) |
 737	     TxUnderrun);
 738
 739	if (debug > 1) {
 740		netdev_dbg(dev, "epic_open() ioaddr %p IRQ %d status %4.4x %s-duplex.\n",
 741			   ioaddr, irq, er32(GENCTL),
 742			   ep->mii.full_duplex ? "full" : "half");
 743	}
 744
 745	/* Set the timer to switch to check for link beat and perhaps switch
 746	   to an alternate media type. */
 747	timer_setup(&ep->timer, epic_timer, 0);
 748	ep->timer.expires = jiffies + 3*HZ;
 749	add_timer(&ep->timer);
 750
 751	return rc;
 752}
 753
 754/* Reset the chip to recover from a PCI transaction error.
 755   This may occur at interrupt time. */
 756static void epic_pause(struct net_device *dev)
 757{
 758	struct net_device_stats *stats = &dev->stats;
 759	struct epic_private *ep = netdev_priv(dev);
 760	void __iomem *ioaddr = ep->ioaddr;
 761
 762	netif_stop_queue (dev);
 763
 764	/* Disable interrupts by clearing the interrupt mask. */
 765	ew32(INTMASK, 0x00000000);
 766	/* Stop the chip's Tx and Rx DMA processes. */
 767	ew16(COMMAND, StopRx | StopTxDMA | StopRxDMA);
 768
 769	/* Update the error counts. */
 770	if (er16(COMMAND) != 0xffff) {
 771		stats->rx_missed_errors	+= er8(MPCNT);
 772		stats->rx_frame_errors	+= er8(ALICNT);
 773		stats->rx_crc_errors	+= er8(CRCCNT);
 774	}
 775
 776	/* Remove the packets on the Rx queue. */
 777	epic_rx(dev, RX_RING_SIZE);
 778}
 779
 780static void epic_restart(struct net_device *dev)
 781{
 782	struct epic_private *ep = netdev_priv(dev);
 783	void __iomem *ioaddr = ep->ioaddr;
 784	int i;
 785
 786	/* Soft reset the chip. */
 787	ew32(GENCTL, 0x4001);
 788
 789	netdev_dbg(dev, "Restarting the EPIC chip, Rx %d/%d Tx %d/%d.\n",
 790		   ep->cur_rx, ep->dirty_rx, ep->dirty_tx, ep->cur_tx);
 791	udelay(1);
 792
 793	/* This magic is documented in SMSC app note 7.15 */
 794	for (i = 16; i > 0; i--)
 795		ew32(TEST1, 0x0008);
 796
 797#ifdef __BIG_ENDIAN
 798	ew32(GENCTL, 0x0432 | (RX_FIFO_THRESH << 8));
 799#else
 800	ew32(GENCTL, 0x0412 | (RX_FIFO_THRESH << 8));
 801#endif
 802	ew32(MIICfg, dev->if_port == 1 ? 0x13 : 0x12);
 803	if (ep->chip_flags & MII_PWRDWN)
 804		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
 805
 806	for (i = 0; i < 3; i++)
 807		ew32(LAN0 + i*4, le16_to_cpu(((__le16*)dev->dev_addr)[i]));
 808
 809	ep->tx_threshold = TX_FIFO_THRESH;
 810	ew32(TxThresh, ep->tx_threshold);
 811	ew32(TxCtrl, ep->mii.full_duplex ? 0x7f : 0x79);
 812	ew32(PRxCDAR, ep->rx_ring_dma +
 813	     (ep->cur_rx % RX_RING_SIZE) * sizeof(struct epic_rx_desc));
 814	ew32(PTxCDAR, ep->tx_ring_dma +
 815	     (ep->dirty_tx % TX_RING_SIZE) * sizeof(struct epic_tx_desc));
 816
 817	/* Start the chip's Rx process. */
 818	set_rx_mode(dev);
 819	ew32(COMMAND, StartRx | RxQueued);
 820
 821	/* Enable interrupts by setting the interrupt mask. */
 822	ew32(INTMASK, RxError | RxHeader | EpicNapiEvent | CntFull |
 823	     ((ep->chip_flags & TYPE2_INTR) ? PCIBusErr175 : PCIBusErr170) |
 824	     TxUnderrun);
 825
 826	netdev_dbg(dev, "epic_restart() done, cmd status %4.4x, ctl %4.4x interrupt %4.4x.\n",
 827		   er32(COMMAND), er32(GENCTL), er32(INTSTAT));
 828}
 829
 830static void check_media(struct net_device *dev)
 831{
 832	struct epic_private *ep = netdev_priv(dev);
 833	void __iomem *ioaddr = ep->ioaddr;
 834	int mii_lpa = ep->mii_phy_cnt ? mdio_read(dev, ep->phys[0], MII_LPA) : 0;
 835	int negotiated = mii_lpa & ep->mii.advertising;
 836	int duplex = (negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040;
 837
 838	if (ep->mii.force_media)
 839		return;
 840	if (mii_lpa == 0xffff)		/* Bogus read */
 841		return;
 842	if (ep->mii.full_duplex != duplex) {
 843		ep->mii.full_duplex = duplex;
 844		netdev_info(dev, "Setting %s-duplex based on MII #%d link partner capability of %4.4x.\n",
 845			    ep->mii.full_duplex ? "full" : "half",
 846			    ep->phys[0], mii_lpa);
 847		ew32(TxCtrl, ep->mii.full_duplex ? 0x7F : 0x79);
 848	}
 849}
 850
 851static void epic_timer(struct timer_list *t)
 852{
 853	struct epic_private *ep = from_timer(ep, t, timer);
 854	struct net_device *dev = ep->mii.dev;
 855	void __iomem *ioaddr = ep->ioaddr;
 856	int next_tick = 5*HZ;
 857
 858	if (debug > 3) {
 859		netdev_dbg(dev, "Media monitor tick, Tx status %8.8x.\n",
 860			   er32(TxSTAT));
 861		netdev_dbg(dev, "Other registers are IntMask %4.4x IntStatus %4.4x RxStatus %4.4x.\n",
 862			   er32(INTMASK), er32(INTSTAT), er32(RxSTAT));
 863	}
 864
 865	check_media(dev);
 866
 867	ep->timer.expires = jiffies + next_tick;
 868	add_timer(&ep->timer);
 869}
 870
 871static void epic_tx_timeout(struct net_device *dev, unsigned int txqueue)
 872{
 873	struct epic_private *ep = netdev_priv(dev);
 874	void __iomem *ioaddr = ep->ioaddr;
 875
 876	if (debug > 0) {
 877		netdev_warn(dev, "Transmit timeout using MII device, Tx status %4.4x.\n",
 878			    er16(TxSTAT));
 879		if (debug > 1) {
 880			netdev_dbg(dev, "Tx indices: dirty_tx %d, cur_tx %d.\n",
 881				   ep->dirty_tx, ep->cur_tx);
 882		}
 883	}
 884	if (er16(TxSTAT) & 0x10) {		/* Tx FIFO underflow. */
 885		dev->stats.tx_fifo_errors++;
 886		ew32(COMMAND, RestartTx);
 887	} else {
 888		epic_restart(dev);
 889		ew32(COMMAND, TxQueued);
 890	}
 891
 892	netif_trans_update(dev); /* prevent tx timeout */
 893	dev->stats.tx_errors++;
 894	if (!ep->tx_full)
 895		netif_wake_queue(dev);
 896}
 897
 898/* Initialize the Rx and Tx rings, along with various 'dev' bits. */
 899static void epic_init_ring(struct net_device *dev)
 900{
 901	struct epic_private *ep = netdev_priv(dev);
 902	int i;
 903
 904	ep->tx_full = 0;
 905	ep->dirty_tx = ep->cur_tx = 0;
 906	ep->cur_rx = ep->dirty_rx = 0;
 907	ep->rx_buf_sz = (dev->mtu <= 1500 ? PKT_BUF_SZ : dev->mtu + 32);
 908
 909	/* Initialize all Rx descriptors. */
 910	for (i = 0; i < RX_RING_SIZE; i++) {
 911		ep->rx_ring[i].rxstatus = 0;
 912		ep->rx_ring[i].buflength = ep->rx_buf_sz;
 913		ep->rx_ring[i].next = ep->rx_ring_dma +
 914				      (i+1)*sizeof(struct epic_rx_desc);
 915		ep->rx_skbuff[i] = NULL;
 916	}
 917	/* Mark the last entry as wrapping the ring. */
 918	ep->rx_ring[i-1].next = ep->rx_ring_dma;
 919
 920	/* Fill in the Rx buffers.  Handle allocation failure gracefully. */
 921	for (i = 0; i < RX_RING_SIZE; i++) {
 922		struct sk_buff *skb = netdev_alloc_skb(dev, ep->rx_buf_sz + 2);
 923		ep->rx_skbuff[i] = skb;
 924		if (skb == NULL)
 925			break;
 926		skb_reserve(skb, 2);	/* 16 byte align the IP header. */
 927		ep->rx_ring[i].bufaddr = dma_map_single(&ep->pci_dev->dev,
 928							skb->data,
 929							ep->rx_buf_sz,
 930							DMA_FROM_DEVICE);
 931		ep->rx_ring[i].rxstatus = DescOwn;
 932	}
 933	ep->dirty_rx = (unsigned int)(i - RX_RING_SIZE);
 934
 935	/* The Tx buffer descriptor is filled in as needed, but we
 936	   do need to clear the ownership bit. */
 937	for (i = 0; i < TX_RING_SIZE; i++) {
 938		ep->tx_skbuff[i] = NULL;
 939		ep->tx_ring[i].txstatus = 0x0000;
 940		ep->tx_ring[i].next = ep->tx_ring_dma +
 941			(i+1)*sizeof(struct epic_tx_desc);
 942	}
 943	ep->tx_ring[i-1].next = ep->tx_ring_dma;
 944}
 945
 946static netdev_tx_t epic_start_xmit(struct sk_buff *skb, struct net_device *dev)
 947{
 948	struct epic_private *ep = netdev_priv(dev);
 949	void __iomem *ioaddr = ep->ioaddr;
 950	int entry, free_count;
 951	u32 ctrl_word;
 952	unsigned long flags;
 953
 954	if (skb_padto(skb, ETH_ZLEN))
 955		return NETDEV_TX_OK;
 956
 957	/* Caution: the write order is important here, set the field with the
 958	   "ownership" bit last. */
 959
 960	/* Calculate the next Tx descriptor entry. */
 961	spin_lock_irqsave(&ep->lock, flags);
 962	free_count = ep->cur_tx - ep->dirty_tx;
 963	entry = ep->cur_tx % TX_RING_SIZE;
 964
 965	ep->tx_skbuff[entry] = skb;
 966	ep->tx_ring[entry].bufaddr = dma_map_single(&ep->pci_dev->dev,
 967						    skb->data, skb->len,
 968						    DMA_TO_DEVICE);
 969	if (free_count < TX_QUEUE_LEN/2) {/* Typical path */
 970		ctrl_word = 0x100000; /* No interrupt */
 971	} else if (free_count == TX_QUEUE_LEN/2) {
 972		ctrl_word = 0x140000; /* Tx-done intr. */
 973	} else if (free_count < TX_QUEUE_LEN - 1) {
 974		ctrl_word = 0x100000; /* No Tx-done intr. */
 975	} else {
 976		/* Leave room for an additional entry. */
 977		ctrl_word = 0x140000; /* Tx-done intr. */
 978		ep->tx_full = 1;
 979	}
 980	ep->tx_ring[entry].buflength = ctrl_word | skb->len;
 981	ep->tx_ring[entry].txstatus =
 982		((skb->len >= ETH_ZLEN ? skb->len : ETH_ZLEN) << 16)
 983			    | DescOwn;
 984
 985	ep->cur_tx++;
 986	if (ep->tx_full)
 987		netif_stop_queue(dev);
 988
 989	spin_unlock_irqrestore(&ep->lock, flags);
 990	/* Trigger an immediate transmit demand. */
 991	ew32(COMMAND, TxQueued);
 992
 993	if (debug > 4)
 994		netdev_dbg(dev, "Queued Tx packet size %d to slot %d, flag %2.2x Tx status %8.8x.\n",
 995			   skb->len, entry, ctrl_word, er32(TxSTAT));
 996
 997	return NETDEV_TX_OK;
 998}
 999
1000static void epic_tx_error(struct net_device *dev, struct epic_private *ep,
1001			  int status)
1002{
1003	struct net_device_stats *stats = &dev->stats;
1004
1005#ifndef final_version
1006	/* There was an major error, log it. */
1007	if (debug > 1)
1008		netdev_dbg(dev, "Transmit error, Tx status %8.8x.\n",
1009			   status);
1010#endif
1011	stats->tx_errors++;
1012	if (status & 0x1050)
1013		stats->tx_aborted_errors++;
1014	if (status & 0x0008)
1015		stats->tx_carrier_errors++;
1016	if (status & 0x0040)
1017		stats->tx_window_errors++;
1018	if (status & 0x0010)
1019		stats->tx_fifo_errors++;
1020}
1021
1022static void epic_tx(struct net_device *dev, struct epic_private *ep)
1023{
1024	unsigned int dirty_tx, cur_tx;
1025
1026	/*
1027	 * Note: if this lock becomes a problem we can narrow the locked
1028	 * region at the cost of occasionally grabbing the lock more times.
1029	 */
1030	cur_tx = ep->cur_tx;
1031	for (dirty_tx = ep->dirty_tx; cur_tx - dirty_tx > 0; dirty_tx++) {
1032		struct sk_buff *skb;
1033		int entry = dirty_tx % TX_RING_SIZE;
1034		int txstatus = ep->tx_ring[entry].txstatus;
1035
1036		if (txstatus & DescOwn)
1037			break;	/* It still hasn't been Txed */
1038
1039		if (likely(txstatus & 0x0001)) {
1040			dev->stats.collisions += (txstatus >> 8) & 15;
1041			dev->stats.tx_packets++;
1042			dev->stats.tx_bytes += ep->tx_skbuff[entry]->len;
1043		} else
1044			epic_tx_error(dev, ep, txstatus);
1045
1046		/* Free the original skb. */
1047		skb = ep->tx_skbuff[entry];
1048		dma_unmap_single(&ep->pci_dev->dev,
1049				 ep->tx_ring[entry].bufaddr, skb->len,
1050				 DMA_TO_DEVICE);
1051		dev_consume_skb_irq(skb);
1052		ep->tx_skbuff[entry] = NULL;
1053	}
1054
1055#ifndef final_version
1056	if (cur_tx - dirty_tx > TX_RING_SIZE) {
1057		netdev_warn(dev, "Out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
1058			    dirty_tx, cur_tx, ep->tx_full);
1059		dirty_tx += TX_RING_SIZE;
1060	}
1061#endif
1062	ep->dirty_tx = dirty_tx;
1063	if (ep->tx_full && cur_tx - dirty_tx < TX_QUEUE_LEN - 4) {
1064		/* The ring is no longer full, allow new TX entries. */
1065		ep->tx_full = 0;
1066		netif_wake_queue(dev);
1067	}
1068}
1069
1070/* The interrupt handler does all of the Rx thread work and cleans up
1071   after the Tx thread. */
1072static irqreturn_t epic_interrupt(int irq, void *dev_instance)
1073{
1074	struct net_device *dev = dev_instance;
1075	struct epic_private *ep = netdev_priv(dev);
1076	void __iomem *ioaddr = ep->ioaddr;
1077	unsigned int handled = 0;
1078	int status;
1079
1080	status = er32(INTSTAT);
1081	/* Acknowledge all of the current interrupt sources ASAP. */
1082	ew32(INTSTAT, status & EpicNormalEvent);
1083
1084	if (debug > 4) {
1085		netdev_dbg(dev, "Interrupt, status=%#8.8x new intstat=%#8.8x.\n",
1086			   status, er32(INTSTAT));
1087	}
1088
1089	if ((status & IntrSummary) == 0)
1090		goto out;
1091
1092	handled = 1;
1093
1094	if (status & EpicNapiEvent) {
1095		spin_lock(&ep->napi_lock);
1096		if (napi_schedule_prep(&ep->napi)) {
1097			epic_napi_irq_off(dev, ep);
1098			__napi_schedule(&ep->napi);
1099		}
1100		spin_unlock(&ep->napi_lock);
1101	}
1102	status &= ~EpicNapiEvent;
1103
1104	/* Check uncommon events all at once. */
1105	if (status & (CntFull | TxUnderrun | PCIBusErr170 | PCIBusErr175)) {
1106		struct net_device_stats *stats = &dev->stats;
1107
1108		if (status == EpicRemoved)
1109			goto out;
1110
1111		/* Always update the error counts to avoid overhead later. */
1112		stats->rx_missed_errors	+= er8(MPCNT);
1113		stats->rx_frame_errors	+= er8(ALICNT);
1114		stats->rx_crc_errors	+= er8(CRCCNT);
1115
1116		if (status & TxUnderrun) { /* Tx FIFO underflow. */
1117			stats->tx_fifo_errors++;
1118			ew32(TxThresh, ep->tx_threshold += 128);
1119			/* Restart the transmit process. */
1120			ew32(COMMAND, RestartTx);
1121		}
1122		if (status & PCIBusErr170) {
1123			netdev_err(dev, "PCI Bus Error! status %4.4x.\n",
1124				   status);
1125			epic_pause(dev);
1126			epic_restart(dev);
1127		}
1128		/* Clear all error sources. */
1129		ew32(INTSTAT, status & 0x7f18);
1130	}
1131
1132out:
1133	if (debug > 3) {
1134		netdev_dbg(dev, "exit interrupt, intr_status=%#4.4x.\n",
1135			   status);
1136	}
1137
1138	return IRQ_RETVAL(handled);
1139}
1140
1141static int epic_rx(struct net_device *dev, int budget)
1142{
1143	struct epic_private *ep = netdev_priv(dev);
1144	int entry = ep->cur_rx % RX_RING_SIZE;
1145	int rx_work_limit = ep->dirty_rx + RX_RING_SIZE - ep->cur_rx;
1146	int work_done = 0;
1147
1148	if (debug > 4)
1149		netdev_dbg(dev, " In epic_rx(), entry %d %8.8x.\n", entry,
1150			   ep->rx_ring[entry].rxstatus);
1151
1152	if (rx_work_limit > budget)
1153		rx_work_limit = budget;
1154
1155	/* If we own the next entry, it's a new packet. Send it up. */
1156	while ((ep->rx_ring[entry].rxstatus & DescOwn) == 0) {
1157		int status = ep->rx_ring[entry].rxstatus;
1158
1159		if (debug > 4)
1160			netdev_dbg(dev, "  epic_rx() status was %8.8x.\n",
1161				   status);
1162		if (--rx_work_limit < 0)
1163			break;
1164		if (status & 0x2006) {
1165			if (debug > 2)
1166				netdev_dbg(dev, "epic_rx() error status was %8.8x.\n",
1167					   status);
1168			if (status & 0x2000) {
1169				netdev_warn(dev, "Oversized Ethernet frame spanned multiple buffers, status %4.4x!\n",
1170					    status);
1171				dev->stats.rx_length_errors++;
1172			} else if (status & 0x0006)
1173				/* Rx Frame errors are counted in hardware. */
1174				dev->stats.rx_errors++;
1175		} else {
1176			/* Malloc up new buffer, compatible with net-2e. */
1177			/* Omit the four octet CRC from the length. */
1178			short pkt_len = (status >> 16) - 4;
1179			struct sk_buff *skb;
1180
1181			if (pkt_len > PKT_BUF_SZ - 4) {
1182				netdev_err(dev, "Oversized Ethernet frame, status %x %d bytes.\n",
1183					   status, pkt_len);
1184				pkt_len = 1514;
1185			}
1186			/* Check if the packet is long enough to accept without copying
1187			   to a minimally-sized skbuff. */
1188			if (pkt_len < rx_copybreak &&
1189			    (skb = netdev_alloc_skb(dev, pkt_len + 2)) != NULL) {
1190				skb_reserve(skb, 2);	/* 16 byte align the IP header */
1191				dma_sync_single_for_cpu(&ep->pci_dev->dev,
1192							ep->rx_ring[entry].bufaddr,
1193							ep->rx_buf_sz,
1194							DMA_FROM_DEVICE);
1195				skb_copy_to_linear_data(skb, ep->rx_skbuff[entry]->data, pkt_len);
1196				skb_put(skb, pkt_len);
1197				dma_sync_single_for_device(&ep->pci_dev->dev,
1198							   ep->rx_ring[entry].bufaddr,
1199							   ep->rx_buf_sz,
1200							   DMA_FROM_DEVICE);
1201			} else {
1202				dma_unmap_single(&ep->pci_dev->dev,
1203						 ep->rx_ring[entry].bufaddr,
1204						 ep->rx_buf_sz,
1205						 DMA_FROM_DEVICE);
1206				skb_put(skb = ep->rx_skbuff[entry], pkt_len);
1207				ep->rx_skbuff[entry] = NULL;
1208			}
1209			skb->protocol = eth_type_trans(skb, dev);
1210			netif_receive_skb(skb);
1211			dev->stats.rx_packets++;
1212			dev->stats.rx_bytes += pkt_len;
1213		}
1214		work_done++;
1215		entry = (++ep->cur_rx) % RX_RING_SIZE;
1216	}
1217
1218	/* Refill the Rx ring buffers. */
1219	for (; ep->cur_rx - ep->dirty_rx > 0; ep->dirty_rx++) {
1220		entry = ep->dirty_rx % RX_RING_SIZE;
1221		if (ep->rx_skbuff[entry] == NULL) {
1222			struct sk_buff *skb;
1223			skb = ep->rx_skbuff[entry] = netdev_alloc_skb(dev, ep->rx_buf_sz + 2);
1224			if (skb == NULL)
1225				break;
1226			skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
1227			ep->rx_ring[entry].bufaddr = dma_map_single(&ep->pci_dev->dev,
1228								    skb->data,
1229								    ep->rx_buf_sz,
1230								    DMA_FROM_DEVICE);
1231			work_done++;
1232		}
1233		/* AV: shouldn't we add a barrier here? */
1234		ep->rx_ring[entry].rxstatus = DescOwn;
1235	}
1236	return work_done;
1237}
1238
1239static void epic_rx_err(struct net_device *dev, struct epic_private *ep)
1240{
1241	void __iomem *ioaddr = ep->ioaddr;
1242	int status;
1243
1244	status = er32(INTSTAT);
1245
1246	if (status == EpicRemoved)
1247		return;
1248	if (status & RxOverflow) 	/* Missed a Rx frame. */
1249		dev->stats.rx_errors++;
1250	if (status & (RxOverflow | RxFull))
1251		ew16(COMMAND, RxQueued);
1252}
1253
1254static int epic_poll(struct napi_struct *napi, int budget)
1255{
1256	struct epic_private *ep = container_of(napi, struct epic_private, napi);
1257	struct net_device *dev = ep->mii.dev;
1258	void __iomem *ioaddr = ep->ioaddr;
1259	int work_done;
1260
1261	epic_tx(dev, ep);
1262
1263	work_done = epic_rx(dev, budget);
1264
1265	epic_rx_err(dev, ep);
1266
1267	if (work_done < budget && napi_complete_done(napi, work_done)) {
1268		unsigned long flags;
1269
1270		spin_lock_irqsave(&ep->napi_lock, flags);
1271
1272		ew32(INTSTAT, EpicNapiEvent);
1273		epic_napi_irq_on(dev, ep);
1274		spin_unlock_irqrestore(&ep->napi_lock, flags);
1275	}
1276
1277	return work_done;
1278}
1279
1280static int epic_close(struct net_device *dev)
1281{
1282	struct epic_private *ep = netdev_priv(dev);
1283	struct pci_dev *pdev = ep->pci_dev;
1284	void __iomem *ioaddr = ep->ioaddr;
1285	struct sk_buff *skb;
1286	int i;
1287
1288	netif_stop_queue(dev);
1289	napi_disable(&ep->napi);
1290
1291	if (debug > 1)
1292		netdev_dbg(dev, "Shutting down ethercard, status was %2.2x.\n",
1293			   er32(INTSTAT));
1294
1295	del_timer_sync(&ep->timer);
1296
1297	epic_disable_int(dev, ep);
1298
1299	free_irq(pdev->irq, dev);
1300
1301	epic_pause(dev);
1302
1303	/* Free all the skbuffs in the Rx queue. */
1304	for (i = 0; i < RX_RING_SIZE; i++) {
1305		skb = ep->rx_skbuff[i];
1306		ep->rx_skbuff[i] = NULL;
1307		ep->rx_ring[i].rxstatus = 0;		/* Not owned by Epic chip. */
1308		ep->rx_ring[i].buflength = 0;
1309		if (skb) {
1310			dma_unmap_single(&pdev->dev, ep->rx_ring[i].bufaddr,
1311					 ep->rx_buf_sz, DMA_FROM_DEVICE);
1312			dev_kfree_skb(skb);
1313		}
1314		ep->rx_ring[i].bufaddr = 0xBADF00D0; /* An invalid address. */
1315	}
1316	for (i = 0; i < TX_RING_SIZE; i++) {
1317		skb = ep->tx_skbuff[i];
1318		ep->tx_skbuff[i] = NULL;
1319		if (!skb)
1320			continue;
1321		dma_unmap_single(&pdev->dev, ep->tx_ring[i].bufaddr, skb->len,
1322				 DMA_TO_DEVICE);
1323		dev_kfree_skb(skb);
1324	}
1325
1326	/* Green! Leave the chip in low-power mode. */
1327	ew32(GENCTL, 0x0008);
1328
1329	return 0;
1330}
1331
1332static struct net_device_stats *epic_get_stats(struct net_device *dev)
1333{
1334	struct epic_private *ep = netdev_priv(dev);
1335	void __iomem *ioaddr = ep->ioaddr;
1336
1337	if (netif_running(dev)) {
1338		struct net_device_stats *stats = &dev->stats;
1339
1340		stats->rx_missed_errors	+= er8(MPCNT);
1341		stats->rx_frame_errors	+= er8(ALICNT);
1342		stats->rx_crc_errors	+= er8(CRCCNT);
1343	}
1344
1345	return &dev->stats;
1346}
1347
1348/* Set or clear the multicast filter for this adaptor.
1349   Note that we only use exclusion around actually queueing the
1350   new frame, not around filling ep->setup_frame.  This is non-deterministic
1351   when re-entered but still correct. */
1352
1353static void set_rx_mode(struct net_device *dev)
1354{
1355	struct epic_private *ep = netdev_priv(dev);
1356	void __iomem *ioaddr = ep->ioaddr;
1357	unsigned char mc_filter[8];		 /* Multicast hash filter */
1358	int i;
1359
1360	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
1361		ew32(RxCtrl, 0x002c);
1362		/* Unconditionally log net taps. */
1363		memset(mc_filter, 0xff, sizeof(mc_filter));
1364	} else if ((!netdev_mc_empty(dev)) || (dev->flags & IFF_ALLMULTI)) {
1365		/* There is apparently a chip bug, so the multicast filter
1366		   is never enabled. */
1367		/* Too many to filter perfectly -- accept all multicasts. */
1368		memset(mc_filter, 0xff, sizeof(mc_filter));
1369		ew32(RxCtrl, 0x000c);
1370	} else if (netdev_mc_empty(dev)) {
1371		ew32(RxCtrl, 0x0004);
1372		return;
1373	} else {					/* Never executed, for now. */
1374		struct netdev_hw_addr *ha;
1375
1376		memset(mc_filter, 0, sizeof(mc_filter));
1377		netdev_for_each_mc_addr(ha, dev) {
1378			unsigned int bit_nr =
1379				ether_crc_le(ETH_ALEN, ha->addr) & 0x3f;
1380			mc_filter[bit_nr >> 3] |= (1 << bit_nr);
1381		}
1382	}
1383	/* ToDo: perhaps we need to stop the Tx and Rx process here? */
1384	if (memcmp(mc_filter, ep->mc_filter, sizeof(mc_filter))) {
1385		for (i = 0; i < 4; i++)
1386			ew16(MC0 + i*4, ((u16 *)mc_filter)[i]);
1387		memcpy(ep->mc_filter, mc_filter, sizeof(mc_filter));
1388	}
1389}
1390
1391static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info)
1392{
1393	struct epic_private *np = netdev_priv(dev);
1394
1395	strscpy(info->driver, DRV_NAME, sizeof(info->driver));
1396	strscpy(info->version, DRV_VERSION, sizeof(info->version));
1397	strscpy(info->bus_info, pci_name(np->pci_dev), sizeof(info->bus_info));
1398}
1399
1400static int netdev_get_link_ksettings(struct net_device *dev,
1401				     struct ethtool_link_ksettings *cmd)
1402{
1403	struct epic_private *np = netdev_priv(dev);
1404
1405	spin_lock_irq(&np->lock);
1406	mii_ethtool_get_link_ksettings(&np->mii, cmd);
1407	spin_unlock_irq(&np->lock);
1408
1409	return 0;
1410}
1411
1412static int netdev_set_link_ksettings(struct net_device *dev,
1413				     const struct ethtool_link_ksettings *cmd)
1414{
1415	struct epic_private *np = netdev_priv(dev);
1416	int rc;
1417
1418	spin_lock_irq(&np->lock);
1419	rc = mii_ethtool_set_link_ksettings(&np->mii, cmd);
1420	spin_unlock_irq(&np->lock);
1421
1422	return rc;
1423}
1424
1425static int netdev_nway_reset(struct net_device *dev)
1426{
1427	struct epic_private *np = netdev_priv(dev);
1428	return mii_nway_restart(&np->mii);
1429}
1430
1431static u32 netdev_get_link(struct net_device *dev)
1432{
1433	struct epic_private *np = netdev_priv(dev);
1434	return mii_link_ok(&np->mii);
1435}
1436
1437static u32 netdev_get_msglevel(struct net_device *dev)
1438{
1439	return debug;
1440}
1441
1442static void netdev_set_msglevel(struct net_device *dev, u32 value)
1443{
1444	debug = value;
1445}
1446
1447static int ethtool_begin(struct net_device *dev)
1448{
1449	struct epic_private *ep = netdev_priv(dev);
1450	void __iomem *ioaddr = ep->ioaddr;
1451
1452	if (ep->ethtool_ops_nesting == U32_MAX)
1453		return -EBUSY;
1454	/* power-up, if interface is down */
1455	if (!ep->ethtool_ops_nesting++ && !netif_running(dev)) {
1456		ew32(GENCTL, 0x0200);
1457		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
1458	}
1459	return 0;
1460}
1461
1462static void ethtool_complete(struct net_device *dev)
1463{
1464	struct epic_private *ep = netdev_priv(dev);
1465	void __iomem *ioaddr = ep->ioaddr;
1466
1467	/* power-down, if interface is down */
1468	if (!--ep->ethtool_ops_nesting && !netif_running(dev)) {
1469		ew32(GENCTL, 0x0008);
1470		ew32(NVCTL, (er32(NVCTL) & ~0x483c) | 0x0000);
1471	}
1472}
1473
1474static const struct ethtool_ops netdev_ethtool_ops = {
1475	.get_drvinfo		= netdev_get_drvinfo,
1476	.nway_reset		= netdev_nway_reset,
1477	.get_link		= netdev_get_link,
1478	.get_msglevel		= netdev_get_msglevel,
1479	.set_msglevel		= netdev_set_msglevel,
1480	.begin			= ethtool_begin,
1481	.complete		= ethtool_complete,
1482	.get_link_ksettings	= netdev_get_link_ksettings,
1483	.set_link_ksettings	= netdev_set_link_ksettings,
1484};
1485
1486static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
1487{
1488	struct epic_private *np = netdev_priv(dev);
1489	void __iomem *ioaddr = np->ioaddr;
1490	struct mii_ioctl_data *data = if_mii(rq);
1491	int rc;
1492
1493	/* power-up, if interface is down */
1494	if (! netif_running(dev)) {
1495		ew32(GENCTL, 0x0200);
1496		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
1497	}
1498
1499	/* all non-ethtool ioctls (the SIOC[GS]MIIxxx ioctls) */
1500	spin_lock_irq(&np->lock);
1501	rc = generic_mii_ioctl(&np->mii, data, cmd, NULL);
1502	spin_unlock_irq(&np->lock);
1503
1504	/* power-down, if interface is down */
1505	if (! netif_running(dev)) {
1506		ew32(GENCTL, 0x0008);
1507		ew32(NVCTL, (er32(NVCTL) & ~0x483c) | 0x0000);
1508	}
1509	return rc;
1510}
1511
1512
1513static void epic_remove_one(struct pci_dev *pdev)
1514{
1515	struct net_device *dev = pci_get_drvdata(pdev);
1516	struct epic_private *ep = netdev_priv(dev);
1517
1518	unregister_netdev(dev);
1519	dma_free_coherent(&pdev->dev, TX_TOTAL_SIZE, ep->tx_ring,
1520			  ep->tx_ring_dma);
1521	dma_free_coherent(&pdev->dev, RX_TOTAL_SIZE, ep->rx_ring,
1522			  ep->rx_ring_dma);
 
1523	pci_iounmap(pdev, ep->ioaddr);
1524	free_netdev(dev);
1525	pci_release_regions(pdev);
 
1526	pci_disable_device(pdev);
1527	/* pci_power_off(pdev, -1); */
1528}
1529
1530static int __maybe_unused epic_suspend(struct device *dev_d)
1531{
1532	struct net_device *dev = dev_get_drvdata(dev_d);
1533	struct epic_private *ep = netdev_priv(dev);
1534	void __iomem *ioaddr = ep->ioaddr;
1535
1536	if (!netif_running(dev))
1537		return 0;
1538	epic_pause(dev);
1539	/* Put the chip into low-power mode. */
1540	ew32(GENCTL, 0x0008);
1541	/* pci_power_off(pdev, -1); */
1542	return 0;
1543}
1544
1545
1546static int __maybe_unused epic_resume(struct device *dev_d)
1547{
1548	struct net_device *dev = dev_get_drvdata(dev_d);
1549
1550	if (!netif_running(dev))
1551		return 0;
1552	epic_restart(dev);
1553	/* pci_power_on(pdev); */
1554	return 0;
1555}
1556
1557static SIMPLE_DEV_PM_OPS(epic_pm_ops, epic_suspend, epic_resume);
1558
1559static struct pci_driver epic_driver = {
1560	.name		= DRV_NAME,
1561	.id_table	= epic_pci_tbl,
1562	.probe		= epic_init_one,
1563	.remove		= epic_remove_one,
1564	.driver.pm	= &epic_pm_ops,
1565};
1566
1567
1568static int __init epic_init (void)
1569{
1570/* when a module, this is printed whether or not devices are found in probe */
1571#ifdef MODULE
1572	pr_info("%s%s\n", version, version2);
1573#endif
1574
1575	return pci_register_driver(&epic_driver);
1576}
1577
1578
1579static void __exit epic_cleanup (void)
1580{
1581	pci_unregister_driver (&epic_driver);
1582}
1583
1584
1585module_init(epic_init);
1586module_exit(epic_cleanup);