cregit-Linux how code gets into the kernel

Release 4.11 drivers/net/ethernet/smsc/epic100.c

Directory: drivers/net/ethernet/smsc
/* epic100.c: A SMC 83c170 EPIC/100 Fast Ethernet driver for Linux. */
/*
        Written/copyright 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 the SMC83c170/175 "EPIC" series, as used on the
        SMC EtherPower II 9432 PCI adapter, and several CardBus cards.

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

        Information and updates available at
        http://www.scyld.com/network/epic100.html
        [this link no longer provides anything useful -jgarzik]

        ---------------------------------------------------------------------

*/


#define DRV_NAME        "epic100"

#define DRV_VERSION     "2.1"

#define DRV_RELDATE     "Sept 11, 2006"

/* The user-configurable values.
   These may be modified when a driver module is loaded.*/


static int debug = 1;			
/* 1 normal messages, 0 quiet .. 7 verbose. */

/* Used to pass the full-duplex flag, etc. */

#define MAX_UNITS 8		
/* More are supported, limit only on options */

static int options[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};

static int full_duplex[MAX_UNITS] = {-1, -1, -1, -1, -1, -1, -1, -1};

/* Set the copy breakpoint for the copy-only-tiny-frames scheme.
   Setting to > 1518 effectively disables this feature. */

static int rx_copybreak;

/* Operational parameters that are set at compile time. */

/* Keep the ring sizes a power of two for operational efficiency.
   The compiler will convert <unsigned>'%'<2^N> into a bit mask.
   Making the Tx ring too large decreases the effectiveness of channel
   bonding and packet priority.
   There are no ill effects from too-large receive rings. */

#define TX_RING_SIZE	256

#define TX_QUEUE_LEN	240		
/* Limit ring entries actually used.  */

#define RX_RING_SIZE	256

#define TX_TOTAL_SIZE	TX_RING_SIZE*sizeof(struct epic_tx_desc)

#define RX_TOTAL_SIZE	RX_RING_SIZE*sizeof(struct epic_rx_desc)

/* Operational parameters that usually are not changed. */
/* Time in jiffies before concluding the transmitter is hung. */

#define TX_TIMEOUT  (2*HZ)


#define PKT_BUF_SZ		1536			
/* Size of each temporary Rx buffer.*/

/* Bytes transferred to chip before transmission starts. */
/* Initial threshold, increased on underflow, rounded down to 4 byte units. */

#define TX_FIFO_THRESH 256

#define RX_FIFO_THRESH 1		
/* 0-3, 0==32, 64,96, or 3==128 bytes  */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/crc32.h>
#include <linux/bitops.h>
#include <asm/io.h>
#include <linux/uaccess.h>
#include <asm/byteorder.h>

/* These identify the driver base version and may not be removed. */

static char version[] =
DRV_NAME ".c:v1.11 1/7/2001 Written by Donald Becker <becker@scyld.com>";

static char version2[] =
"  (unofficial 2.4.x kernel port, version " DRV_VERSION ", " DRV_RELDATE ")";

MODULE_AUTHOR("Donald Becker <becker@scyld.com>");
MODULE_DESCRIPTION("SMC 83c170 EPIC series Ethernet driver");
MODULE_LICENSE("GPL");

module_param(debug, int, 0);
module_param(rx_copybreak, int, 0);
module_param_array(options, int, NULL, 0);
module_param_array(full_duplex, int, NULL, 0);
MODULE_PARM_DESC(debug, "EPIC/100 debug level (0-5)");
MODULE_PARM_DESC(options, "EPIC/100: Bits 0-3: media type, bit 4: full duplex");
MODULE_PARM_DESC(rx_copybreak, "EPIC/100 copy breakpoint for copy-only-tiny-frames");
MODULE_PARM_DESC(full_duplex, "EPIC/100 full duplex setting(s) (1)");

/*
                                Theory of Operation

I. Board Compatibility

This device driver is designed for the SMC "EPIC/100", the SMC
single-chip Ethernet controllers for PCI.  This chip is used on
the SMC EtherPower II boards.

II. Board-specific settings

PCI bus devices are configured by the system at boot time, so no jumpers
need to be set on the board.  The system BIOS will assign the
PCI INTA signal to a (preferably otherwise unused) system IRQ line.
Note: Kernel versions earlier than 1.3.73 do not support shared PCI
interrupt lines.

III. Driver operation

IIIa. Ring buffers

IVb. References

http://www.smsc.com/media/Downloads_Public/discontinued/83c171.pdf
http://www.smsc.com/media/Downloads_Public/discontinued/83c175.pdf
http://scyld.com/expert/NWay.html
http://www.national.com/pf/DP/DP83840A.html

IVc. Errata

*/






enum chip_capability_flags { MII_PWRDWN=1, TYPE2_INTR=2, NO_MII=4 };


#define EPIC_TOTAL_SIZE 0x100

#define USE_IO_OPS 1

#ifdef USE_IO_OPS

#define EPIC_BAR	0
#else

#define EPIC_BAR	1
#endif

typedef enum {
	
SMSC_83C170_0,
	
SMSC_83C170,
	
SMSC_83C175,
} 
chip_t;



struct epic_chip_info {
	
const char *name;
        
int drv_flags;                          /* Driver use, intended as capability flags. */
};


/* indexed by chip_t */

static const struct epic_chip_info pci_id_tbl[] = {
	{ "SMSC EPIC/100 83c170",	TYPE2_INTR | NO_MII | MII_PWRDWN },
	{ "SMSC EPIC/100 83c170",	TYPE2_INTR },
	{ "SMSC EPIC/C 83c175",		TYPE2_INTR | MII_PWRDWN },
};



static const struct pci_device_id epic_pci_tbl[] = {
	{ 0x10B8, 0x0005, 0x1092, 0x0AB4, 0, 0, SMSC_83C170_0 },
	{ 0x10B8, 0x0005, PCI_ANY_ID, PCI_ANY_ID, 0, 0, SMSC_83C170 },
	{ 0x10B8, 0x0006, PCI_ANY_ID, PCI_ANY_ID,
	  PCI_CLASS_NETWORK_ETHERNET << 8, 0xffff00, SMSC_83C175 },
	{ 0,}
};
MODULE_DEVICE_TABLE (pci, epic_pci_tbl);


#define ew16(reg, val)	iowrite16(val, ioaddr + (reg))

#define ew32(reg, val)	iowrite32(val, ioaddr + (reg))

#define er8(reg)	ioread8(ioaddr + (reg))

#define er16(reg)	ioread16(ioaddr + (reg))

#define er32(reg)	ioread32(ioaddr + (reg))

/* Offsets to registers, using the (ugh) SMC names. */

enum epic_registers {
  





COMMAND=0, INTSTAT=4, INTMASK=8, GENCTL=0x0C, NVCTL=0x10, EECTL=0x14,
  
PCIBurstCnt=0x18,
  



TEST1=0x1C, CRCCNT=0x20, ALICNT=0x24, MPCNT=0x28,	/* Rx error counters. */
  


MIICtrl=0x30, MIIData=0x34, MIICfg=0x38,
  
LAN0=64,						/* MAC address. */
  
MC0=80,						/* Multicast filter table. */
  


RxCtrl=96, TxCtrl=112, TxSTAT=0x74,
  




PRxCDAR=0x84, RxSTAT=0xA4, EarlyRx=0xB0, PTxCDAR=0xC4, TxThresh=0xDC,
};

/* Interrupt register bits, using my own meaningful names. */

enum IntrStatus {
	


TxIdle=0x40000, RxIdle=0x20000, IntrSummary=0x010000,
	


PCIBusErr170=0x7000, PCIBusErr175=0x1000, PhyEvent175=0x8000,
	



RxStarted=0x0800, RxEarlyWarn=0x0400, CntFull=0x0200, TxUnderrun=0x0100,
	


TxEmpty=0x0080, TxDone=0x0020, RxError=0x0010,
	



RxOverflow=0x0008, RxFull=0x0004, RxHeader=0x0002, RxDone=0x0001,
};

enum CommandBits {
	



StopRx=1, StartRx=2, TxQueued=4, RxQueued=8,
	


StopTxDMA=0x20, StopRxDMA=0x40, RestartTx=0x80,
};


#define EpicRemoved	0xffffffff	
/* Chip failed or removed (CardBus) */


#define EpicNapiEvent	(TxEmpty | TxDone | \
                         RxDone | RxStarted | RxEarlyWarn | RxOverflow | RxFull)

#define EpicNormalEvent	(0x0000ffff & ~EpicNapiEvent)


static const u16 media2miictl[16] = {
	0, 0x0C00, 0x0C00, 0x2000,  0x0100, 0x2100, 0, 0,
	0, 0, 0, 0,  0, 0, 0, 0 };

/*
 * The EPIC100 Rx and Tx buffer descriptors.  Note that these
 * really ARE host-endian; it's not a misannotation.  We tell
 * the card to byteswap them internally on big-endian hosts -
 * look for #ifdef __BIG_ENDIAN in epic_open().
 */


struct epic_tx_desc {
	
u32 txstatus;
	
u32 bufaddr;
	
u32 buflength;
	
u32 next;
};


struct epic_rx_desc {
	
u32 rxstatus;
	
u32 bufaddr;
	
u32 buflength;
	
u32 next;
};


enum desc_status_bits {
	
DescOwn=0x8000,
};


#define PRIV_ALIGN	15 	
/* Required alignment mask */

struct epic_private {
	
struct epic_rx_desc *rx_ring;
	
struct epic_tx_desc *tx_ring;
	/* The saved address of a sent-in-place packet/buffer, for skfree(). */
	
struct sk_buff* tx_skbuff[TX_RING_SIZE];
	/* The addresses of receive-in-place skbuffs. */
	
struct sk_buff* rx_skbuff[RX_RING_SIZE];

	
dma_addr_t tx_ring_dma;
	
dma_addr_t rx_ring_dma;

	/* Ring pointers. */
	
spinlock_t lock;				/* Group with Tx control cache line. */
	
spinlock_t napi_lock;
	
struct napi_struct napi;
	

unsigned int cur_tx, dirty_tx;

	

unsigned int cur_rx, dirty_rx;
	
u32 irq_mask;
	
unsigned int rx_buf_sz;				/* Based on MTU+slack. */

	
void __iomem *ioaddr;
	
struct pci_dev *pci_dev;			/* PCI bus location. */
	

int chip_id, chip_flags;

	
struct timer_list timer;			/* Media selection timer. */
	
int tx_threshold;
	
unsigned char mc_filter[8];
	
signed char phys[4];				/* MII device addresses. */
	
u16 advertising;					/* NWay media advertisement */
	
int mii_phy_cnt;
	
struct mii_if_info mii;
	
unsigned int tx_full:1;				/* The Tx queue is full. */
	
unsigned int default_port:4;		/* Last dev->if_port value. */
};

static int epic_open(struct net_device *dev);
static int read_eeprom(struct epic_private *, int);
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 loc, int val);
static void epic_restart(struct net_device *dev);
static void epic_timer(unsigned long data);
static void epic_tx_timeout(struct net_device *dev);
static void epic_init_ring(struct net_device *dev);
static netdev_tx_t epic_start_xmit(struct sk_buff *skb,
				   struct net_device *dev);
static int epic_rx(struct net_device *dev, int budget);
static int epic_poll(struct napi_struct *napi, int budget);
static irqreturn_t epic_interrupt(int irq, void *dev_instance);
static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);

static const struct ethtool_ops netdev_ethtool_ops;
static int epic_close(struct net_device *dev);
static struct net_device_stats *epic_get_stats(struct net_device *dev);
static void set_rx_mode(struct net_device *dev);


static const struct net_device_ops epic_netdev_ops = {
	.ndo_open		= epic_open,
	.ndo_stop		= epic_close,
	.ndo_start_xmit		= epic_start_xmit,
	.ndo_tx_timeout 	= epic_tx_timeout,
	.ndo_get_stats		= epic_get_stats,
	.ndo_set_rx_mode	= set_rx_mode,
	.ndo_do_ioctl 		= netdev_ioctl,
	.ndo_set_mac_address 	= eth_mac_addr,
	.ndo_validate_addr	= eth_validate_addr,
};




static int epic_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	static int card_idx = -1;
	void __iomem *ioaddr;
	int chip_idx = (int) ent->driver_data;
	int irq;
	struct net_device *dev;
	struct epic_private *ep;
	int i, ret, option = 0, duplex = 0;
	void *ring_space;
	dma_addr_t ring_dma;

/* when built into the kernel, we only print version if device is found */
#ifndef MODULE
	pr_info_once("%s%s\n", version, version2);
#endif

	card_idx++;

	ret = pci_enable_device(pdev);
	if (ret)
		goto out;
	irq = pdev->irq;

	if (pci_resource_len(pdev, 0) < EPIC_TOTAL_SIZE) {
		dev_err(&pdev->dev, "no PCI region space\n");
		ret = -ENODEV;
		goto err_out_disable;
	}

	pci_set_master(pdev);

	ret = pci_request_regions(pdev, DRV_NAME);
	if (ret < 0)
		goto err_out_disable;

	ret = -ENOMEM;

	dev = alloc_etherdev(sizeof (*ep));
	if (!dev)
		goto err_out_free_res;

	SET_NETDEV_DEV(dev, &pdev->dev);

	ioaddr = pci_iomap(pdev, EPIC_BAR, 0);
	if (!ioaddr) {
		dev_err(&pdev->dev, "ioremap failed\n");
		goto err_out_free_netdev;
	}

	pci_set_drvdata(pdev, dev);
	ep = netdev_priv(dev);
	ep->ioaddr = ioaddr;
	ep->mii.dev = dev;
	ep->mii.mdio_read = mdio_read;
	ep->mii.mdio_write = mdio_write;
	ep->mii.phy_id_mask = 0x1f;
	ep->mii.reg_num_mask = 0x1f;

	ring_space = pci_alloc_consistent(pdev, TX_TOTAL_SIZE, &ring_dma);
	if (!ring_space)
		goto err_out_iounmap;
	ep->tx_ring = ring_space;
	ep->tx_ring_dma = ring_dma;

	ring_space = pci_alloc_consistent(pdev, RX_TOTAL_SIZE, &ring_dma);
	if (!ring_space)
		goto err_out_unmap_tx;
	ep->rx_ring = ring_space;
	ep->rx_ring_dma = ring_dma;

	if (dev->mem_start) {
		option = dev->mem_start;
		duplex = (dev->mem_start & 16) ? 1 : 0;
	} else if (card_idx >= 0  &&  card_idx < MAX_UNITS) {
		if (options[card_idx] >= 0)
			option = options[card_idx];
		if (full_duplex[card_idx] >= 0)
			duplex = full_duplex[card_idx];
	}

	spin_lock_init(&ep->lock);
	spin_lock_init(&ep->napi_lock);

	/* Bring the chip out of low-power mode. */
	ew32(GENCTL, 0x4200);
	/* Magic?!  If we don't set this bit the MII interface won't work. */
	/* This magic is documented in SMSC app note 7.15 */
	for (i = 16; i > 0; i--)
		ew32(TEST1, 0x0008);

	/* Turn on the MII transceiver. */
	ew32(MIICfg, 0x12);
	if (chip_idx == 1)
		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
	ew32(GENCTL, 0x0200);

	/* Note: the '175 does not have a serial EEPROM. */
	for (i = 0; i < 3; i++)
		((__le16 *)dev->dev_addr)[i] = cpu_to_le16(er16(LAN0 + i*4));

	if (debug > 2) {
		dev_dbg(&pdev->dev, "EEPROM contents:\n");
		for (i = 0; i < 64; i++)
			pr_cont(" %4.4x%s", read_eeprom(ep, i),
				   i % 16 == 15 ? "\n" : "");
	}

	ep->pci_dev = pdev;
	ep->chip_id = chip_idx;
	ep->chip_flags = pci_id_tbl[chip_idx].drv_flags;
	ep->irq_mask =
		(ep->chip_flags & TYPE2_INTR ?  PCIBusErr175 : PCIBusErr170)
		 | CntFull | TxUnderrun | EpicNapiEvent;

	/* Find the connected MII xcvrs.
           Doing this in open() would allow detecting external xcvrs later, but
           takes much time and no cards have external MII. */
	{
		int phy, phy_idx = 0;
		for (phy = 1; phy < 32 && phy_idx < sizeof(ep->phys); phy++) {
			int mii_status = mdio_read(dev, phy, MII_BMSR);
			if (mii_status != 0xffff  &&  mii_status != 0x0000) {
				ep->phys[phy_idx++] = phy;
				dev_info(&pdev->dev,
					"MII transceiver #%d control "
					"%4.4x status %4.4x.\n",
					phy, mdio_read(dev, phy, 0), mii_status);
			}
		}
		ep->mii_phy_cnt = phy_idx;
		if (phy_idx != 0) {
			phy = ep->phys[0];
			ep->mii.advertising = mdio_read(dev, phy, MII_ADVERTISE);
			dev_info(&pdev->dev,
				"Autonegotiation advertising %4.4x link "
				   "partner %4.4x.\n",
				   ep->mii.advertising, mdio_read(dev, phy, 5));
		} else if ( ! (ep->chip_flags & NO_MII)) {
			dev_warn(&pdev->dev,
				"***WARNING***: No MII transceiver found!\n");
			/* Use the known PHY address of the EPII. */
			ep->phys[0] = 3;
		}
		ep->mii.phy_id = ep->phys[0];
	}

	/* Turn off the MII xcvr (175 only!), leave the chip in low-power mode. */
	if (ep->chip_flags & MII_PWRDWN)
		ew32(NVCTL, er32(NVCTL) & ~0x483c);
	ew32(GENCTL, 0x0008);

	/* The lower four bits are the media type. */
	if (duplex) {
		ep->mii.force_media = ep->mii.full_duplex = 1;
		dev_info(&pdev->dev, "Forced full duplex requested.\n");
	}
	dev->if_port = ep->default_port = option;

	/* The Epic-specific entries in the device structure. */
	dev->netdev_ops = &epic_netdev_ops;
	dev->ethtool_ops = &netdev_ethtool_ops;
	dev->watchdog_timeo = TX_TIMEOUT;
	netif_napi_add(dev, &ep->napi, epic_poll, 64);

	ret = register_netdev(dev);
	if (ret < 0)
		goto err_out_unmap_rx;

	netdev_info(dev, "%s at %lx, IRQ %d, %pM\n",
		    pci_id_tbl[chip_idx].name,
		    (long)pci_resource_start(pdev, EPIC_BAR), pdev->irq,
		    dev->dev_addr);

out:
	return ret;

err_out_unmap_rx:
	pci_free_consistent(pdev, RX_TOTAL_SIZE, ep->rx_ring, ep->rx_ring_dma);
err_out_unmap_tx:
	pci_free_consistent(pdev, TX_TOTAL_SIZE, ep->tx_ring, ep->tx_ring_dma);
err_out_iounmap:
	pci_iounmap(pdev, ioaddr);
err_out_free_netdev:
	free_netdev(dev);
err_out_free_res:
	pci_release_regions(pdev);
err_out_disable:
	pci_disable_device(pdev);
	goto out;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)47744.37%621.43%


Linus Torvalds24422.70%310.71%


François Romieu16615.44%414.29%


Jeff Garzik14013.02%725.00%


Stephen Hemminger211.95%310.71%


Krzysztof Hałasa141.30%13.57%


Ben Boeckel70.65%13.57%


Wang Chen30.28%13.57%


Al Viro20.19%13.57%


Joe Perches10.09%13.57%


Total1075100.00%28100.00%



/* Serial EEPROM section. */

/*  EEPROM_Ctrl bits. */

#define EE_SHIFT_CLK	0x04	
/* EEPROM shift clock. */

#define EE_CS			0x02	
/* EEPROM chip select. */

#define EE_DATA_WRITE	0x08	
/* EEPROM chip data in. */

#define EE_WRITE_0		0x01

#define EE_WRITE_1		0x09

#define EE_DATA_READ	0x10	
/* EEPROM chip data out. */

#define EE_ENB			(0x0001 | EE_CS)

/* Delay between EEPROM clock transitions.
   This serves to flush the operation to the PCI bus.
 */


#define eeprom_delay()	er32(EECTL)

/* The EEPROM commands include the alway-set leading bit. */

#define EE_WRITE_CMD	(5 << 6)

#define EE_READ64_CMD	(6 << 6)

#define EE_READ256_CMD	(6 << 8)

#define EE_ERASE_CMD	(7 << 6)




static void epic_disable_int(struct net_device *dev, struct epic_private *ep)
{
	void __iomem *ioaddr = ep->ioaddr;

	ew32(INTMASK, 0x00000000);
}


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François Romieu2371.88%266.67%


Linus Torvalds (pre-git)928.12%133.33%


Total32100.00%3100.00%






static inline void __epic_pci_commit(void __iomem *ioaddr)
{
#ifndef USE_IO_OPS
	er32(INTMASK);
#endif
}


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François Romieu22100.00%2100.00%


Total22100.00%2100.00%






static inline void epic_napi_irq_off(struct net_device *dev,
				     struct epic_private *ep)
{
	void __iomem *ioaddr = ep->ioaddr;

	ew32(INTMASK, ep->irq_mask & ~EpicNapiEvent);
	__epic_pci_commit(ioaddr);
}


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static inline void epic_napi_irq_on(struct net_device *dev,
				    struct epic_private *ep)
{
	void __iomem *ioaddr = ep->ioaddr;

	/* No need to commit possible posted write */
	ew32(INTMASK, ep->irq_mask | EpicNapiEvent);
}


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static int read_eeprom(struct epic_private *ep, int location)
{
	void __iomem *ioaddr = ep->ioaddr;
	int i;
	int retval = 0;
	int read_cmd = location |
		(er32(EECTL) & 0x40 ? EE_READ64_CMD : EE_READ256_CMD);

	ew32(EECTL, EE_ENB & ~EE_CS);
	ew32(EECTL, EE_ENB);

	/* Shift the read command bits out. */
	for (i = 12; i >= 0; i--) {
		short dataval = (read_cmd & (1 << i)) ? EE_WRITE_1 : EE_WRITE_0;
		ew32(EECTL, EE_ENB | dataval);
		eeprom_delay();
		ew32(EECTL, EE_ENB | dataval | EE_SHIFT_CLK);
		eeprom_delay();
	}
	ew32(EECTL, EE_ENB);

	for (i = 16; i > 0; i--) {
		ew32(EECTL, EE_ENB | EE_SHIFT_CLK);
		eeprom_delay();
		retval = (retval << 1) | ((er32(EECTL) & EE_DATA_READ) ? 1 : 0);
		ew32(EECTL, EE_ENB);
		eeprom_delay();
	}

	/* Terminate the EEPROM access. */
	ew32(EECTL, EE_ENB & ~EE_CS);
	return retval;
}


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François Romieu4119.90%150.00%


Total206100.00%2100.00%




#define MII_READOP		1

#define MII_WRITEOP		2



static int mdio_read(struct net_device *dev, int phy_id, int location)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;
	int read_cmd = (phy_id << 9) | (location << 4) | MII_READOP;
	int i;

	ew32(MIICtrl, read_cmd);
	/* Typical operation takes 25 loops. */
	for (i = 400; i > 0; i--) {
		barrier();
		if ((er32(MIICtrl) & MII_READOP) == 0) {
			/* Work around read failure bug. */
			if (phy_id == 1 && location < 6 &&
			    er16(MIIData) == 0xffff) {
				ew32(MIICtrl, read_cmd);
				continue;
			}
			return er16(MIIData);
		}
	}
	return 0xffff;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6044.78%125.00%


Linus Torvalds5037.31%250.00%


François Romieu2417.91%125.00%


Total134100.00%4100.00%






static void mdio_write(struct net_device *dev, int phy_id, int loc, int value)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;
	int i;

	ew16(MIIData, value);
	ew32(MIICtrl, (phy_id << 9) | (loc << 4) | MII_WRITEOP);
	for (i = 10000; i > 0; i--) {
		barrier();
		if ((er32(MIICtrl) & MII_WRITEOP) == 0)
			break;
	}
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6565.00%125.00%


François Romieu2222.00%125.00%


Linus Torvalds1313.00%250.00%


Total100100.00%4100.00%






static int epic_open(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;
	const int irq = ep->pci_dev->irq;
	int rc, i;

	/* Soft reset the chip. */
	ew32(GENCTL, 0x4001);

	napi_enable(&ep->napi);
	rc = request_irq(irq, epic_interrupt, IRQF_SHARED, dev->name, dev);
	if (rc) {
		napi_disable(&ep->napi);
		return rc;
	}

	epic_init_ring(dev);

	ew32(GENCTL, 0x4000);
	/* This magic is documented in SMSC app note 7.15 */
	for (i = 16; i > 0; i--)
		ew32(TEST1, 0x0008);

	/* Pull the chip out of low-power mode, enable interrupts, and set for
           PCI read multiple.  The MIIcfg setting and strange write order are
           required by the details of which bits are reset and the transceiver
           wiring on the Ositech CardBus card.
        */
#if 0
	ew32(MIICfg, dev->if_port == 1 ? 0x13 : 0x12);
#endif
	if (ep->chip_flags & MII_PWRDWN)
		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);

	/* Tell the chip to byteswap descriptors on big-endian hosts */
#ifdef __BIG_ENDIAN
	ew32(GENCTL, 0x4432 | (RX_FIFO_THRESH << 8));
	er32(GENCTL);
	ew32(GENCTL, 0x0432 | (RX_FIFO_THRESH << 8));
#else
	ew32(GENCTL, 0x4412 | (RX_FIFO_THRESH << 8));
	er32(GENCTL);
	ew32(GENCTL, 0x0412 | (RX_FIFO_THRESH << 8));
#endif

	udelay(20); /* Looks like EPII needs that if you want reliable RX init. FIXME: pci posting bug? */

	for (i = 0; i < 3; i++)
		ew32(LAN0 + i*4, le16_to_cpu(((__le16*)dev->dev_addr)[i]));

	ep->tx_threshold = TX_FIFO_THRESH;
	ew32(TxThresh, ep->tx_threshold);

	if (media2miictl[dev->if_port & 15]) {
		if (ep->mii_phy_cnt)
			mdio_write(dev, ep->phys[0], MII_BMCR, media2miictl[dev->if_port&15]);
		if (dev->if_port == 1) {
			if (debug > 1)
				netdev_info(dev, "Using the 10base2 transceiver, MII status %4.4x.\n",
					    mdio_read(dev, ep->phys[0], MII_BMSR));
		}
	} else {
		int mii_lpa = mdio_read(dev, ep->phys[0], MII_LPA);
		if (mii_lpa != 0xffff) {
			if ((mii_lpa & LPA_100FULL) || (mii_lpa & 0x01C0) == LPA_10FULL)
				ep->mii.full_duplex = 1;
			else if (! (mii_lpa & LPA_LPACK))
				mdio_write(dev, ep->phys[0], MII_BMCR, BMCR_ANENABLE|BMCR_ANRESTART);
			if (debug > 1)
				netdev_info(dev, "Setting %s-duplex based on MII xcvr %d register read of %4.4x.\n",
					    ep->mii.full_duplex ? "full"
								: "half",
					    ep->phys[0], mii_lpa);
		}
	}

	ew32(TxCtrl, ep->mii.full_duplex ? 0x7f : 0x79);
	ew32(PRxCDAR, ep->rx_ring_dma);
	ew32(PTxCDAR, ep->tx_ring_dma);

	/* Start the chip's Rx process. */
	set_rx_mode(dev);
	ew32(COMMAND, StartRx | RxQueued);

	netif_start_queue(dev);

	/* Enable interrupts by setting the interrupt mask. */
	ew32(INTMASK, RxError | RxHeader | EpicNapiEvent | CntFull |
	     ((ep->chip_flags & TYPE2_INTR) ? PCIBusErr175 : PCIBusErr170) |
	     TxUnderrun);

	if (debug > 1) {
		netdev_dbg(dev, "epic_open() ioaddr %p IRQ %d status %4.4x %s-duplex.\n",
			   ioaddr, irq, er32(GENCTL),
			   ep->mii.full_duplex ? "full" : "half");
	}

	/* Set the timer to switch to check for link beat and perhaps switch
           to an alternate media type. */
	init_timer(&ep->timer);
	ep->timer.expires = jiffies + 3*HZ;
	ep->timer.data = (unsigned long)dev;
	ep->timer.function = epic_timer;				/* timer handler */
	add_timer(&ep->timer);

	return rc;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)46771.85%426.67%


François Romieu9114.00%16.67%


Jeff Garzik294.46%213.33%


Krzysztof Hałasa192.92%16.67%


Stephen Hemminger182.77%16.67%


Ben Boeckel91.38%16.67%


Linus Torvalds71.08%16.67%


Al Viro50.77%16.67%


Wang Chen30.46%16.67%


Roland Dreier10.15%16.67%


Thomas Gleixner10.15%16.67%


Total650100.00%15100.00%



/* Reset the chip to recover from a PCI transaction error.
   This may occur at interrupt time. */



static void epic_pause(struct net_device *dev)
{
	struct net_device_stats *stats = &dev->stats;
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;

	netif_stop_queue (dev);

	/* Disable interrupts by clearing the interrupt mask. */
	ew32(INTMASK, 0x00000000);
	/* Stop the chip's Tx and Rx DMA processes. */
	ew16(COMMAND, StopRx | StopTxDMA | StopRxDMA);

	/* Update the error counts. */
	if (er16(COMMAND) != 0xffff) {
		stats->rx_missed_errors	+= er8(MPCNT);
		stats->rx_frame_errors	+= er8(ALICNT);
		stats->rx_crc_errors	+= er8(CRCCNT);
	}

	/* Remove the packets on the Rx queue. */
	epic_rx(dev, RX_RING_SIZE);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7264.29%360.00%


François Romieu4035.71%240.00%


Total112100.00%5100.00%






static void epic_restart(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;
	int i;

	/* Soft reset the chip. */
	ew32(GENCTL, 0x4001);

	netdev_dbg(dev, "Restarting the EPIC chip, Rx %d/%d Tx %d/%d.\n",
		   ep->cur_rx, ep->dirty_rx, ep->dirty_tx, ep->cur_tx);
	udelay(1);

	/* This magic is documented in SMSC app note 7.15 */
	for (i = 16; i > 0; i--)
		ew32(TEST1, 0x0008);

#ifdef __BIG_ENDIAN
	ew32(GENCTL, 0x0432 | (RX_FIFO_THRESH << 8));
#else
	ew32(GENCTL, 0x0412 | (RX_FIFO_THRESH << 8));
#endif
	ew32(MIICfg, dev->if_port == 1 ? 0x13 : 0x12);
	if (ep->chip_flags & MII_PWRDWN)
		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);

	for (i = 0; i < 3; i++)
		ew32(LAN0 + i*4, le16_to_cpu(((__le16*)dev->dev_addr)[i]));

	ep->tx_threshold = TX_FIFO_THRESH;
	ew32(TxThresh, ep->tx_threshold);
	ew32(TxCtrl, ep->mii.full_duplex ? 0x7f : 0x79);
	ew32(PRxCDAR, ep->rx_ring_dma +
	     (ep->cur_rx % RX_RING_SIZE) * sizeof(struct epic_rx_desc));
	ew32(PTxCDAR, ep->tx_ring_dma +
	     (ep->dirty_tx % TX_RING_SIZE) * sizeof(struct epic_tx_desc));

	/* Start the chip's Rx process. */
	set_rx_mode(dev);
	ew32(COMMAND, StartRx | RxQueued);

	/* Enable interrupts by setting the interrupt mask. */
	ew32(INTMASK, RxError | RxHeader | EpicNapiEvent | CntFull |
	     ((ep->chip_flags & TYPE2_INTR) ? PCIBusErr175 : PCIBusErr170) |
	     TxUnderrun);

	netdev_dbg(dev, "epic_restart() done, cmd status %4.4x, ctl %4.4x interrupt %4.4x.\n",
		   er32(COMMAND), er32(GENCTL), er32(INTSTAT));
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)22364.83%541.67%


François Romieu6819.77%18.33%


Linus Torvalds3710.76%18.33%


Ben Boeckel61.74%18.33%


Al Viro41.16%18.33%


Wang Chen30.87%18.33%


Jeff Garzik20.58%18.33%


Roland Dreier10.29%18.33%


Total344100.00%12100.00%






static void check_media(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;
	int mii_lpa = ep->mii_phy_cnt ? mdio_read(dev, ep->phys[0], MII_LPA) : 0;
	int negotiated = mii_lpa & ep->mii.advertising;
	int duplex = (negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040;

	if (ep->mii.force_media)
		return;
	if (mii_lpa == 0xffff)		/* Bogus read */
		return;
	if (ep->mii.full_duplex != duplex) {
		ep->mii.full_duplex = duplex;
		netdev_info(dev, "Setting %s-duplex based on MII #%d link partner capability of %4.4x.\n",
			    ep->mii.full_duplex ? "full" : "half",
			    ep->phys[0], mii_lpa);
		ew32(TxCtrl, ep->mii.full_duplex ? 0x7F : 0x79);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)7547.17%545.45%


Linus Torvalds5232.70%19.09%


Jeff Garzik1811.32%218.18%


François Romieu85.03%19.09%


Ben Boeckel31.89%19.09%


Wang Chen31.89%19.09%


Total159100.00%11100.00%






static void epic_timer(unsigned long data)
{
	struct net_device *dev = (struct net_device *)data;
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;
	int next_tick = 5*HZ;

	if (debug > 3) {
		netdev_dbg(dev, "Media monitor tick, Tx status %8.8x.\n",
			   er32(TxSTAT));
		netdev_dbg(dev, "Other registers are IntMask %4.4x IntStatus %4.4x RxStatus %4.4x.\n",
			   er32(INTMASK), er32(INTSTAT), er32(RxSTAT));
	}

	check_media(dev);

	ep->timer.expires = jiffies + next_tick;
	add_timer(&ep->timer);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds5952.21%114.29%


Linus Torvalds (pre-git)3631.86%342.86%


François Romieu97.96%114.29%


Ben Boeckel65.31%114.29%


Wang Chen32.65%114.29%


Total113100.00%7100.00%






static void epic_tx_timeout(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;

	if (debug > 0) {
		netdev_warn(dev, "Transmit timeout using MII device, Tx status %4.4x.\n",
			    er16(TxSTAT));
		if (debug > 1) {
			netdev_dbg(dev, "Tx indices: dirty_tx %d, cur_tx %d.\n",
				   ep->dirty_tx, ep->cur_tx);
		}
	}
	if (er16(TxSTAT) & 0x10) {		/* Tx FIFO underflow. */
		dev->stats.tx_fifo_errors++;
		ew32(COMMAND, RestartTx);
	} else {
		epic_restart(dev);
		ew32(COMMAND, TxQueued);
	}

	netif_trans_update(dev); /* prevent tx timeout */
	dev->stats.tx_errors++;
	if (!ep->tx_full)
		netif_wake_queue(dev);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)9971.22%646.15%


François Romieu139.35%17.69%


Linus Torvalds128.63%17.69%


Ben Boeckel64.32%17.69%


Wang Chen32.16%17.69%


Florian Westphal32.16%17.69%


Vasiliy Kulikov21.44%17.69%


Eric Dumazet10.72%17.69%


Total139100.00%13100.00%



/* Initialize the Rx and Tx rings, along with various 'dev' bits. */



static void epic_init_ring(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	int i;

	ep->tx_full = 0;
	ep->dirty_tx = ep->cur_tx = 0;
	ep->cur_rx = ep->dirty_rx = 0;
	ep->rx_buf_sz = (dev->mtu <= 1500 ? PKT_BUF_SZ : dev->mtu + 32);

	/* Initialize all Rx descriptors. */
	for (i = 0; i < RX_RING_SIZE; i++) {
		ep->rx_ring[i].rxstatus = 0;
		ep->rx_ring[i].buflength = ep->rx_buf_sz;
		ep->rx_ring[i].next = ep->rx_ring_dma +
				      (i+1)*sizeof(struct epic_rx_desc);
		ep->rx_skbuff[i] = NULL;
	}
	/* Mark the last entry as wrapping the ring. */
	ep->rx_ring[i-1].next = ep->rx_ring_dma;

	/* Fill in the Rx buffers.  Handle allocation failure gracefully. */
	for (i = 0; i < RX_RING_SIZE; i++) {
		struct sk_buff *skb = netdev_alloc_skb(dev, ep->rx_buf_sz + 2);
		ep->rx_skbuff[i] = skb;
		if (skb == NULL)
			break;
		skb_reserve(skb, 2);	/* 16 byte align the IP header. */
		ep->rx_ring[i].bufaddr = pci_map_single(ep->pci_dev,
			skb->data, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
		ep->rx_ring[i].rxstatus = DescOwn;
	}
	ep->dirty_rx = (unsigned int)(i - RX_RING_SIZE);

	/* The Tx buffer descriptor is filled in as needed, but we
           do need to clear the ownership bit. */
	for (i = 0; i < TX_RING_SIZE; i++) {
		ep->tx_skbuff[i] = NULL;
		ep->tx_ring[i].txstatus = 0x0000;
		ep->tx_ring[i].next = ep->tx_ring_dma +
			(i+1)*sizeof(struct epic_tx_desc);
	}
	ep->tx_ring[i-1].next = ep->tx_ring_dma;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)30187.76%545.45%


Linus Torvalds319.04%19.09%


Wang Chen30.87%19.09%


Pradeep A. Dalvi30.87%19.09%


Al Viro20.58%19.09%


Jarek Poplawski20.58%19.09%


David S. Miller10.29%19.09%


Total343100.00%11100.00%






static netdev_tx_t epic_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;
	int entry, free_count;
	u32 ctrl_word;
	unsigned long flags;

	if (skb_padto(skb, ETH_ZLEN))
		return NETDEV_TX_OK;

	/* Caution: the write order is important here, set the field with the
           "ownership" bit last. */

	/* Calculate the next Tx descriptor entry. */
	spin_lock_irqsave(&ep->lock, flags);
	free_count = ep->cur_tx - ep->dirty_tx;
	entry = ep->cur_tx % TX_RING_SIZE;

	ep->tx_skbuff[entry] = skb;
	ep->tx_ring[entry].bufaddr = pci_map_single(ep->pci_dev, skb->data,
		 			            skb->len, PCI_DMA_TODEVICE);
	if (free_count < TX_QUEUE_LEN/2) {/* Typical path */
		ctrl_word = 0x100000; /* No interrupt */
	} else if (free_count == TX_QUEUE_LEN/2) {
		ctrl_word = 0x140000; /* Tx-done intr. */
	} else if (free_count < TX_QUEUE_LEN - 1) {
		ctrl_word = 0x100000; /* No Tx-done intr. */
	} else {
		/* Leave room for an additional entry. */
		ctrl_word = 0x140000; /* Tx-done intr. */
		ep->tx_full = 1;
	}
	ep->tx_ring[entry].buflength = ctrl_word | skb->len;
	ep->tx_ring[entry].txstatus =
		((skb->len >= ETH_ZLEN ? skb->len : ETH_ZLEN) << 16)
			    | DescOwn;

	ep->cur_tx++;
	if (ep->tx_full)
		netif_stop_queue(dev);

	spin_unlock_irqrestore(&ep->lock, flags);
	/* Trigger an immediate transmit demand. */
	ew32(COMMAND, TxQueued);

	if (debug > 4)
		netdev_dbg(dev, "Queued Tx packet size %d to slot %d, flag %2.2x Tx status %8.8x.\n",
			   skb->len, entry, ctrl_word, er32(TxSTAT));

	return NETDEV_TX_OK;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)23981.29%538.46%


Linus Torvalds217.14%17.69%


François Romieu134.42%17.69%


Alan Cox113.74%17.69%


Wang Chen31.02%17.69%


Ben Boeckel31.02%17.69%


Patrick McHardy20.68%17.69%


Jeff Garzik10.34%17.69%


Stephen Hemminger10.34%17.69%


Total294100.00%13100.00%






static void epic_tx_error(struct net_device *dev, struct epic_private *ep,
			  int status)
{
	struct net_device_stats *stats = &dev->stats;

#ifndef final_version
	/* There was an major error, log it. */
	if (debug > 1)
		netdev_dbg(dev, "Transmit error, Tx status %8.8x.\n",
			   status);
#endif
	stats->tx_errors++;
	if (status & 0x1050)
		stats->tx_aborted_errors++;
	if (status & 0x0008)
		stats->tx_carrier_errors++;
	if (status & 0x0040)
		stats->tx_window_errors++;
	if (status & 0x0010)
		stats->tx_fifo_errors++;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5656.57%342.86%


François Romieu3838.38%114.29%


Ben Boeckel33.03%114.29%


Jeff Garzik11.01%114.29%


Vasiliy Kulikov11.01%114.29%


Total99100.00%7100.00%






static void epic_tx(struct net_device *dev, struct epic_private *ep)
{
	unsigned int dirty_tx, cur_tx;

	/*
         * Note: if this lock becomes a problem we can narrow the locked
         * region at the cost of occasionally grabbing the lock more times.
         */
	cur_tx = ep->cur_tx;
	for (dirty_tx = ep->dirty_tx; cur_tx - dirty_tx > 0; dirty_tx++) {
		struct sk_buff *skb;
		int entry = dirty_tx % TX_RING_SIZE;
		int txstatus = ep->tx_ring[entry].txstatus;

		if (txstatus & DescOwn)
			break;	/* It still hasn't been Txed */

		if (likely(txstatus & 0x0001)) {
			dev->stats.collisions += (txstatus >> 8) & 15;
			dev->stats.tx_packets++;
			dev->stats.tx_bytes += ep->tx_skbuff[entry]->len;
		} else
			epic_tx_error(dev, ep, txstatus);

		/* Free the original skb. */
		skb = ep->tx_skbuff[entry];
		pci_unmap_single(ep->pci_dev, ep->tx_ring[entry].bufaddr,
				 skb->len, PCI_DMA_TODEVICE);
		dev_kfree_skb_irq(skb);
		ep->tx_skbuff[entry] = NULL;
	}

#ifndef final_version
	if (cur_tx - dirty_tx > TX_RING_SIZE) {
		netdev_warn(dev, "Out-of-sync dirty pointer, %d vs. %d, full=%d.\n",
			    dirty_tx, cur_tx, ep->tx_full);
		dirty_tx += TX_RING_SIZE;
	}
#endif
	ep->dirty_tx = dirty_tx;
	if (ep->tx_full && cur_tx - dirty_tx < TX_QUEUE_LEN - 4) {
		/* The ring is no longer full, allow new TX entries. */
		ep->tx_full = 0;
		netif_wake_queue(dev);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)17469.32%444.44%


François Romieu3513.94%111.11%


Linus Torvalds3513.94%111.11%


Ben Boeckel31.20%111.11%


Vasiliy Kulikov31.20%111.11%


Al Viro10.40%111.11%


Total251100.00%9100.00%



/* The interrupt handler does all of the Rx thread work and cleans up
   after the Tx thread. */



static irqreturn_t epic_interrupt(int irq, void *dev_instance)
{
	struct net_device *dev = dev_instance;
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;
	unsigned int handled = 0;
	int status;

	status = er32(INTSTAT);
	/* Acknowledge all of the current interrupt sources ASAP. */
	ew32(INTSTAT, status & EpicNormalEvent);

	if (debug > 4) {
		netdev_dbg(dev, "Interrupt, status=%#8.8x new intstat=%#8.8x.\n",
			   status, er32(INTSTAT));
	}

	if ((status & IntrSummary) == 0)
		goto out;

	handled = 1;

	if (status & EpicNapiEvent) {
		spin_lock(&ep->napi_lock);
		if (napi_schedule_prep(&ep->napi)) {
			epic_napi_irq_off(dev, ep);
			__napi_schedule(&ep->napi);
		}
		spin_unlock(&ep->napi_lock);
	}
	status &= ~EpicNapiEvent;

	/* Check uncommon events all at once. */
	if (status & (CntFull | TxUnderrun | PCIBusErr170 | PCIBusErr175)) {
		struct net_device_stats *stats = &dev->stats;

		if (status == EpicRemoved)
			goto out;

		/* Always update the error counts to avoid overhead later. */
		stats->rx_missed_errors	+= er8(MPCNT);
		stats->rx_frame_errors	+= er8(ALICNT);
		stats->rx_crc_errors	+= er8(CRCCNT);

		if (status & TxUnderrun) { /* Tx FIFO underflow. */
			stats->tx_fifo_errors++;
			ew32(TxThresh, ep->tx_threshold += 128);
			/* Restart the transmit process. */
			ew32(COMMAND, RestartTx);
		}
		if (status & PCIBusErr170) {
			netdev_err(dev, "PCI Bus Error! status %4.4x.\n",
				   status);
			epic_pause(dev);
			epic_restart(dev);
		}
		/* Clear all error sources. */
		ew32(INTSTAT, status & 0x7f18);
	}

out:
	if (debug > 3) {
		netdev_dbg(dev, "exit interrupt, intr_status=%#4.4x.\n",
			   status);
	}

	return IRQ_RETVAL(handled);
}


Contributors
PersonTokensPropCommitsCommitProp
François Romieu15849.53%533.33%


Linus Torvalds (pre-git)12338.56%426.67%


Linus Torvalds103.13%16.67%


Ben Boeckel92.82%16.67%


Stephen Hemminger82.51%16.67%


Jeff Garzik61.88%16.67%


Wang Chen30.94%16.67%


Ben Hutchings20.63%16.67%


Total319100.00%15100.00%






static int epic_rx(struct net_device *dev, int budget)
{
	struct epic_private *ep = netdev_priv(dev);
	int entry = ep->cur_rx % RX_RING_SIZE;
	int rx_work_limit = ep->dirty_rx + RX_RING_SIZE - ep->cur_rx;
	int work_done = 0;

	if (debug > 4)
		netdev_dbg(dev, " In epic_rx(), entry %d %8.8x.\n", entry,
			   ep->rx_ring[entry].rxstatus);

	if (rx_work_limit > budget)
		rx_work_limit = budget;

	/* If we own the next entry, it's a new packet. Send it up. */
	while ((ep->rx_ring[entry].rxstatus & DescOwn) == 0) {
		int status = ep->rx_ring[entry].rxstatus;

		if (debug > 4)
			netdev_dbg(dev, "  epic_rx() status was %8.8x.\n",
				   status);
		if (--rx_work_limit < 0)
			break;
		if (status & 0x2006) {
			if (debug > 2)
				netdev_dbg(dev, "epic_rx() error status was %8.8x.\n",
					   status);
			if (status & 0x2000) {
				netdev_warn(dev, "Oversized Ethernet frame spanned multiple buffers, status %4.4x!\n",
					    status);
				dev->stats.rx_length_errors++;
			} else if (status & 0x0006)
				/* Rx Frame errors are counted in hardware. */
				dev->stats.rx_errors++;
		} else {
			/* Malloc up new buffer, compatible with net-2e. */
			/* Omit the four octet CRC from the length. */
			short pkt_len = (status >> 16) - 4;
			struct sk_buff *skb;

			if (pkt_len > PKT_BUF_SZ - 4) {
				netdev_err(dev, "Oversized Ethernet frame, status %x %d bytes.\n",
					   status, pkt_len);
				pkt_len = 1514;
			}
			/* Check if the packet is long enough to accept without copying
                           to a minimally-sized skbuff. */
			if (pkt_len < rx_copybreak &&
			    (skb = netdev_alloc_skb(dev, pkt_len + 2)) != NULL) {
				skb_reserve(skb, 2);	/* 16 byte align the IP header */
				pci_dma_sync_single_for_cpu(ep->pci_dev,
							    ep->rx_ring[entry].bufaddr,
							    ep->rx_buf_sz,
							    PCI_DMA_FROMDEVICE);
				skb_copy_to_linear_data(skb, ep->rx_skbuff[entry]->data, pkt_len);
				skb_put(skb, pkt_len);
				pci_dma_sync_single_for_device(ep->pci_dev,
							       ep->rx_ring[entry].bufaddr,
							       ep->rx_buf_sz,
							       PCI_DMA_FROMDEVICE);
			} else {
				pci_unmap_single(ep->pci_dev,
					ep->rx_ring[entry].bufaddr,
					ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
				skb_put(skb = ep->rx_skbuff[entry], pkt_len);
				ep->rx_skbuff[entry] = NULL;
			}
			skb->protocol = eth_type_trans(skb, dev);
			netif_receive_skb(skb);
			dev->stats.rx_packets++;
			dev->stats.rx_bytes += pkt_len;
		}
		work_done++;
		entry = (++ep->cur_rx) % RX_RING_SIZE;
	}

	/* Refill the Rx ring buffers. */
	for (; ep->cur_rx - ep->dirty_rx > 0; ep->dirty_rx++) {
		entry = ep->dirty_rx % RX_RING_SIZE;
		if (ep->rx_skbuff[entry] == NULL) {
			struct sk_buff *skb;
			skb = ep->rx_skbuff[entry] = netdev_alloc_skb(dev, ep->rx_buf_sz + 2);
			if (skb == NULL)
				break;
			skb_reserve(skb, 2);	/* Align IP on 16 byte boundaries */
			ep->rx_ring[entry].bufaddr = pci_map_single(ep->pci_dev,
				skb->data, ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
			work_done++;
		}
		/* AV: shouldn't we add a barrier here? */
		ep->rx_ring[entry].rxstatus = DescOwn;
	}
	return work_done;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)43777.21%527.78%


Andrew Morton447.77%15.56%


Linus Torvalds376.54%316.67%


Ben Boeckel152.65%15.56%


François Romieu142.47%15.56%


Pradeep A. Dalvi61.06%15.56%


Vasiliy Kulikov40.71%15.56%


Wang Chen30.53%15.56%


David S. Miller30.53%211.11%


Jarek Poplawski20.35%15.56%


Al Viro10.18%15.56%


Total566100.00%18100.00%






static void epic_rx_err(struct net_device *dev, struct epic_private *ep)
{
	void __iomem *ioaddr = ep->ioaddr;
	int status;

	status = er32(INTSTAT);

	if (status == EpicRemoved)
		return;
	if (status & RxOverflow) 	/* Missed a Rx frame. */
		dev->stats.rx_errors++;
	if (status & (RxOverflow | RxFull))
		ew16(COMMAND, RxQueued);
}


Contributors
PersonTokensPropCommitsCommitProp
François Romieu7298.63%266.67%


Vasiliy Kulikov11.37%133.33%


Total73100.00%3100.00%






static int epic_poll(struct napi_struct *napi, int budget)
{
	struct epic_private *ep = container_of(napi, struct epic_private, napi);
	struct net_device *dev = ep->mii.dev;
	void __iomem *ioaddr = ep->ioaddr;
	int work_done;

	epic_tx(dev, ep);

	work_done = epic_rx(dev, budget);

	epic_rx_err(dev, ep);

	if (work_done < budget && napi_complete_done(napi, work_done)) {
		unsigned long flags;

		spin_lock_irqsave(&ep->napi_lock, flags);

		ew32(INTSTAT, EpicNapiEvent);
		epic_napi_irq_on(dev, ep);
		spin_unlock_irqrestore(&ep->napi_lock, flags);
	}

	return work_done;
}


Contributors
PersonTokensPropCommitsCommitProp
François Romieu9975.57%466.67%


Stephen Hemminger2116.03%116.67%


Eric Dumazet118.40%116.67%


Total131100.00%6100.00%






static int epic_close(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	struct pci_dev *pdev = ep->pci_dev;
	void __iomem *ioaddr = ep->ioaddr;
	struct sk_buff *skb;
	int i;

	netif_stop_queue(dev);
	napi_disable(&ep->napi);

	if (debug > 1)
		netdev_dbg(dev, "Shutting down ethercard, status was %2.2x.\n",
			   er32(INTSTAT));

	del_timer_sync(&ep->timer);

	epic_disable_int(dev, ep);

	free_irq(pdev->irq, dev);

	epic_pause(dev);

	/* Free all the skbuffs in the Rx queue. */
	for (i = 0; i < RX_RING_SIZE; i++) {
		skb = ep->rx_skbuff[i];
		ep->rx_skbuff[i] = NULL;
		ep->rx_ring[i].rxstatus = 0;		/* Not owned by Epic chip. */
		ep->rx_ring[i].buflength = 0;
		if (skb) {
			pci_unmap_single(pdev, ep->rx_ring[i].bufaddr,
					 ep->rx_buf_sz, PCI_DMA_FROMDEVICE);
			dev_kfree_skb(skb);
		}
		ep->rx_ring[i].bufaddr = 0xBADF00D0; /* An invalid address. */
	}
	for (i = 0; i < TX_RING_SIZE; i++) {
		skb = ep->tx_skbuff[i];
		ep->tx_skbuff[i] = NULL;
		if (!skb)
			continue;
		pci_unmap_single(pdev, ep->tx_ring[i].bufaddr, skb->len,
				 PCI_DMA_TODEVICE);
		dev_kfree_skb(skb);
	}

	/* Green! Leave the chip in low-power mode. */
	ew32(GENCTL, 0x0008);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)16658.87%750.00%


Linus Torvalds6422.70%17.14%


François Romieu3612.77%214.29%


Stephen Hemminger82.84%17.14%


Ben Boeckel31.06%17.14%


Wang Chen31.06%17.14%


Al Viro20.71%17.14%


Total282100.00%14100.00%






static struct net_device_stats *epic_get_stats(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;

	if (netif_running(dev)) {
		struct net_device_stats *stats = &dev->stats;

		stats->rx_missed_errors	+= er8(MPCNT);
		stats->rx_frame_errors	+= er8(ALICNT);
		stats->rx_crc_errors	+= er8(CRCCNT);
	}

	return &dev->stats;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5363.10%360.00%


François Romieu2934.52%120.00%


Vasiliy Kulikov22.38%120.00%


Total84100.00%5100.00%



/* Set or clear the multicast filter for this adaptor.
   Note that we only use exclusion around actually queueing the
   new frame, not around filling ep->setup_frame.  This is non-deterministic
   when re-entered but still correct. */




static void set_rx_mode(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;
	unsigned char mc_filter[8];		 /* Multicast hash filter */
	int i;

	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous. */
		ew32(RxCtrl, 0x002c);
		/* Unconditionally log net taps. */
		memset(mc_filter, 0xff, sizeof(mc_filter));
	} else if ((!netdev_mc_empty(dev)) || (dev->flags & IFF_ALLMULTI)) {
		/* There is apparently a chip bug, so the multicast filter
                   is never enabled. */
		/* Too many to filter perfectly -- accept all multicasts. */
		memset(mc_filter, 0xff, sizeof(mc_filter));
		ew32(RxCtrl, 0x000c);
	} else if (netdev_mc_empty(dev)) {
		ew32(RxCtrl, 0x0004);
		return;
	} else {					/* Never executed, for now. */
		struct netdev_hw_addr *ha;

		memset(mc_filter, 0, sizeof(mc_filter));
		netdev_for_each_mc_addr(ha, dev) {
			unsigned int bit_nr =
				ether_crc_le(ETH_ALEN, ha->addr) & 0x3f;
			mc_filter[bit_nr >> 3] |= (1 << bit_nr);
		}
	}
	/* ToDo: perhaps we need to stop the Tx and Rx process here? */
	if (memcmp(mc_filter, ep->mc_filter, sizeof(mc_filter))) {
		for (i = 0; i < 4; i++)
			ew16(MC0 + i*4, ((u16 *)mc_filter)[i]);
		memcpy(ep->mc_filter, mc_filter, sizeof(mc_filter));
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)19275.29%753.85%


François Romieu259.80%17.69%


Jeff Garzik187.06%17.69%


Jiri Pirko176.67%323.08%


Wang Chen31.18%17.69%


Total255100.00%13100.00%






static void netdev_get_drvinfo (struct net_device *dev, struct ethtool_drvinfo *info)
{
	struct epic_private *np = netdev_priv(dev);

	strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
	strlcpy(info->version, DRV_VERSION, sizeof(info->version));
	strlcpy(info->bus_info, pci_name(np->pci_dev), sizeof(info->bus_info));
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds4151.90%120.00%


Rick Jones2430.38%120.00%


Jeff Garzik810.13%120.00%


Randy Dunlap33.80%120.00%


Wang Chen33.80%120.00%


Total79100.00%5100.00%






static int netdev_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct epic_private *np = netdev_priv(dev);
	int rc;

	spin_lock_irq(&np->lock);
	rc = mii_ethtool_gset(&np->mii, cmd);
	spin_unlock_irq(&np->lock);

	return rc;
}


Contributors
PersonTokensPropCommitsCommitProp
Jeff Garzik5795.00%266.67%


Wang Chen35.00%133.33%


Total60100.00%3100.00%






static int netdev_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	struct epic_private *np = netdev_priv(dev);
	int rc;

	spin_lock_irq(&np->lock);
	rc = mii_ethtool_sset(&np->mii, cmd);
	spin_unlock_irq(&np->lock);

	return rc;
}


Contributors
PersonTokensPropCommitsCommitProp
Jeff Garzik5795.00%266.67%


Wang Chen35.00%133.33%


Total60100.00%3100.00%






static int netdev_nway_reset(struct net_device *dev)
{
	struct epic_private *np = netdev_priv(dev);
	return mii_nway_restart(&np->mii);
}


Contributors
PersonTokensPropCommitsCommitProp
Jeff Garzik2790.00%266.67%


Wang Chen310.00%133.33%


Total30100.00%3100.00%






static u32 netdev_get_link(struct net_device *dev)
{
	struct epic_private *np = netdev_priv(dev);
	return mii_link_ok(&np->mii);
}


Contributors
PersonTokensPropCommitsCommitProp
Jeff Garzik2790.00%266.67%


Wang Chen310.00%133.33%


Total30100.00%3100.00%






static u32 netdev_get_msglevel(struct net_device *dev)
{
	return debug;
}


Contributors
PersonTokensPropCommitsCommitProp
Jeff Garzik14100.00%2100.00%


Total14100.00%2100.00%






static void netdev_set_msglevel(struct net_device *dev, u32 value)
{
	debug = value;
}


Contributors
PersonTokensPropCommitsCommitProp
Jeff Garzik1794.44%266.67%


Linus Torvalds15.56%133.33%


Total18100.00%3100.00%






static int ethtool_begin(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;

	/* power-up, if interface is down */
	if (!netif_running(dev)) {
		ew32(GENCTL, 0x0200);
		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
	}
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Alan Cox4566.18%150.00%


François Romieu2333.82%150.00%


Total68100.00%2100.00%






static void ethtool_complete(struct net_device *dev)
{
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;

	/* power-down, if interface is down */
	if (!netif_running(dev)) {
		ew32(GENCTL, 0x0008);
		ew32(NVCTL, (er32(NVCTL) & ~0x483c) | 0x0000);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Alan Cox4264.62%150.00%


François Romieu2335.38%150.00%


Total65100.00%2100.00%




static const struct ethtool_ops netdev_ethtool_ops = {
	.get_drvinfo		= netdev_get_drvinfo,
	.get_settings		= netdev_get_settings,
	.set_settings		= netdev_set_settings,
	.nway_reset		= netdev_nway_reset,
	.get_link		= netdev_get_link,
	.get_msglevel		= netdev_get_msglevel,
	.set_msglevel		= netdev_set_msglevel,
	.begin			= ethtool_begin,
	.complete		= ethtool_complete
};




static int netdev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
	struct epic_private *np = netdev_priv(dev);
	void __iomem *ioaddr = np->ioaddr;
	struct mii_ioctl_data *data = if_mii(rq);
	int rc;

	/* power-up, if interface is down */
	if (! netif_running(dev)) {
		ew32(GENCTL, 0x0200);
		ew32(NVCTL, (er32(NVCTL) & ~0x003c) | 0x4800);
	}

	/* all non-ethtool ioctls (the SIOC[GS]MIIxxx ioctls) */
	spin_lock_irq(&np->lock);
	rc = generic_mii_ioctl(&np->mii, data, cmd, NULL);
	spin_unlock_irq(&np->lock);

	/* power-down, if interface is down */
	if (! netif_running(dev)) {
		ew32(GENCTL, 0x0008);
		ew32(NVCTL, (er32(NVCTL) & ~0x483c) | 0x0000);
	}
	return rc;
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)8453.50%535.71%


Jeff Garzik3622.93%321.43%


François Romieu2113.38%17.14%


Linus Torvalds106.37%321.43%


Al Viro31.91%17.14%


Wang Chen31.91%17.14%


Total157100.00%14100.00%






static void epic_remove_one(struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev);
	struct epic_private *ep = netdev_priv(dev);

	pci_free_consistent(pdev, TX_TOTAL_SIZE, ep->tx_ring, ep->tx_ring_dma);
	pci_free_consistent(pdev, RX_TOTAL_SIZE, ep->rx_ring, ep->rx_ring_dma);
	unregister_netdev(dev);
	pci_iounmap(pdev, ep->ioaddr);
	pci_release_regions(pdev);
	free_netdev(dev);
	pci_disable_device(pdev);
	/* pci_power_off(pdev, -1); */
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds4448.35%110.00%


Linus Torvalds (pre-git)3336.26%550.00%


François Romieu1010.99%220.00%


Wang Chen33.30%110.00%


Stephen Hemminger11.10%110.00%


Total91100.00%10100.00%



#ifdef CONFIG_PM




static int epic_suspend (struct pci_dev *pdev, pm_message_t state)
{
	struct net_device *dev = pci_get_drvdata(pdev);
	struct epic_private *ep = netdev_priv(dev);
	void __iomem *ioaddr = ep->ioaddr;

	if (!netif_running(dev))
		return 0;
	epic_pause(dev);
	/* Put the chip into low-power mode. */
	ew32(GENCTL, 0x0008);
	/* pci_power_off(pdev, -1); */
	return 0;
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3143.66%444.44%


Linus Torvalds2129.58%333.33%


François Romieu1825.35%111.11%


Pavel Machek11.41%111.11%


Total71100.00%9100.00%






static int epic_resume (struct pci_dev *pdev)
{
	struct net_device *dev = pci_get_drvdata(pdev);

	if (!netif_running(dev))
		return 0;
	epic_restart(dev);
	/* pci_power_on(pdev); */
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2253.66%457.14%


Linus Torvalds1946.34%342.86%


Total41100.00%7100.00%



#endif /* CONFIG_PM */



static struct pci_driver epic_driver = {
	.name		= DRV_NAME,
	.id_table	= epic_pci_tbl,
	.probe		= epic_init_one,
	.remove		= epic_remove_one,
#ifdef CONFIG_PM
	.suspend	= epic_suspend,
	.resume		= epic_resume,
#endif /* CONFIG_PM */
};





static int __init epic_init (void)
{
/* when a module, this is printed whether or not devices are found in probe */
#ifdef MODULE
	pr_info("%s%s\n", version, version2);
#endif

	return pci_register_driver(&epic_driver);
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1548.39%562.50%


Linus Torvalds1341.94%112.50%


Ben Boeckel26.45%112.50%


Jeff Garzik13.23%112.50%


Total31100.00%8100.00%






static void __exit epic_cleanup (void)
{
	pci_unregister_driver (&epic_driver);
}



Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)15100.00%5100.00%


Total15100.00%5100.00%




module_init(epic_init);

module_exit(epic_cleanup);

Overall Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)470058.04%1819.78%


François Romieu131216.20%88.79%


Linus Torvalds94911.72%1112.09%


Jeff Garzik5156.36%1314.29%


Stephen Hemminger1371.69%55.49%


Alan Cox1071.32%22.20%


Ben Boeckel770.95%11.10%


Andrew Morton640.79%22.20%


Wang Chen570.70%11.10%


Krzysztof Hałasa330.41%11.10%


Rick Jones240.30%11.10%


Al Viro200.25%33.30%


Jiri Pirko180.22%44.40%


Vasiliy Kulikov130.16%11.10%


Rusty Russell120.15%11.10%


Eric Dumazet120.15%22.20%


Pradeep A. Dalvi90.11%11.10%


Roland Dreier60.07%11.10%


Benoit Taine60.07%11.10%


Jarek Poplawski40.05%11.10%


David S. Miller40.05%22.20%


Florian Westphal30.04%11.10%


Randy Dunlap30.04%11.10%


Patrick McHardy20.02%11.10%


Andy Gospodarek20.02%11.10%


Ben Hutchings20.02%11.10%


Arjan van de Ven20.02%11.10%


Joe Perches10.01%11.10%


Thomas Gleixner10.01%11.10%


Adrian Bunk10.01%11.10%


Justin P. Mattock10.01%11.10%


Pavel Machek10.01%11.10%


Bill Pemberton0.00%00.00%


Greg Kroah-Hartman0.00%00.00%


Total8098100.00%91100.00%


Directory: drivers/net/ethernet/smsc



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