pcnet32.c

Linux内核源代码 为压缩文件 是<<Linux内核>>一书中的源代码

/* pcnet32.c: An AMD PCnet32 ethernet driver for linux. */
/*
 *	Copyright 1996-1999 Thomas Bogendoerfer
 * 
 *	Derived from the lance driver written 1993,1994,1995 by Donald Becker.
 * 
 *	Copyright 1993 United States Government as represented by the
 *	Director, National Security Agency.
 * 
 *	This software may be used and distributed according to the terms
 *	of the GNU Public License, incorporated herein by reference.
 *
 *	This driver is for PCnet32 and PCnetPCI based ethercards
 */

static const char *version = "pcnet32.c:v1.25kf 26.9.1999 [e-mail]\n";

#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/malloc.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>

static unsigned int pcnet32_portlist[] __initdata = {0x300, 0x320, 0x340, 0x360, 0};

static int pcnet32_debug = 1;
static int tx_start = 1; /* Mapping -- 0:20, 1:64, 2:128, 3:~220 (depends on chip vers) */

static struct net_device *pcnet32_dev;

static const int max_interrupt_work = 80;
static const int rx_copybreak = 200;

#define PORT_AUI      0x00
#define PORT_10BT     0x01
#define PORT_GPSI     0x02
#define PORT_MII      0x03

#define PORT_PORTSEL  0x03
#define PORT_ASEL     0x04
#define PORT_100      0x40
#define PORT_FD	      0x80

#define PCNET32_DMA_MASK 0xffffffff

/*
 * table to translate option values from tulip
 * to internal options
 */
static unsigned char options_mapping[] = {
    PORT_ASEL,			   /*  0 Auto-select	  */
    PORT_AUI,			   /*  1 BNC/AUI	  */
    PORT_AUI,			   /*  2 AUI/BNC	  */ 
    PORT_ASEL,			   /*  3 not supported	  */
    PORT_10BT | PORT_FD,	   /*  4 10baseT-FD	  */
    PORT_ASEL,			   /*  5 not supported	  */
    PORT_ASEL,			   /*  6 not supported	  */
    PORT_ASEL,			   /*  7 not supported	  */
    PORT_ASEL,			   /*  8 not supported	  */
    PORT_MII,			   /*  9 MII 10baseT	  */
    PORT_MII | PORT_FD,		   /* 10 MII 10baseT-FD	  */
    PORT_MII,			   /* 11 MII (autosel)	  */
    PORT_10BT,			   /* 12 10BaseT	  */
    PORT_MII | PORT_100,	   /* 13 MII 100BaseTx	  */
    PORT_MII | PORT_100 | PORT_FD, /* 14 MII 100BaseTx-FD */
    PORT_ASEL			   /* 15 not supported	  */
};

#define MAX_UNITS 8
static int options[MAX_UNITS];
static int full_duplex[MAX_UNITS];

/*
 *				Theory of Operation
 * 
 * This driver uses the same software structure as the normal lance
 * driver. So look for a verbose description in lance.c. The differences
 * to the normal lance driver is the use of the 32bit mode of PCnet32
 * and PCnetPCI chips. Because these chips are 32bit chips, there is no
 * 16MB limitation and we don't need bounce buffers.
 */
 
/*
 * History:
 * v0.01:  Initial version
 *	   only tested on Alpha Noname Board
 * v0.02:  changed IRQ handling for new interrupt scheme (dev_id)
 *	   tested on a ASUS SP3G
 * v0.10:  fixed an odd problem with the 79C974 in a Compaq Deskpro XL
 *	   looks like the 974 doesn't like stopping and restarting in a
 *	   short period of time; now we do a reinit of the lance; the
 *	   bug was triggered by doing ifconfig eth0 <ip> broadcast <addr>
 *	   and hangs the machine (thanks to Klaus Liedl for debugging)
 * v0.12:  by suggestion from Donald Becker: Renamed driver to pcnet32,
 *	   made it standalone (no need for lance.c)
 * v0.13:  added additional PCI detecting for special PCI devices (Compaq)
 * v0.14:  stripped down additional PCI probe (thanks to David C Niemi
 *	   and [e-mail] for testing this on their Compaq boxes)
 * v0.15:  added 79C965 (VLB) probe
 *	   added interrupt sharing for PCI chips
 * v0.16:  fixed set_multicast_list on Alpha machines
 * v0.17:  removed hack from dev.c; now pcnet32 uses ethif_probe in Space.c
 * v0.19:  changed setting of autoselect bit
 * v0.20:  removed additional Compaq PCI probe; there is now a working one
 *	   in arch/i386/bios32.c
 * v0.21:  added endian conversion for ppc, from work by [e-mail]
 * v0.22:  added printing of status to ring dump
 * v0.23:  changed enet_statistics to net_devive_stats
 * v0.90:  added multicast filter
 *	   added module support
 *	   changed irq probe to new style
 *	   added PCnetFast chip id
 *	   added fix for receive stalls with Intel saturn chipsets
 *	   added in-place rx skbs like in the tulip driver
 *	   minor cleanups
 * v0.91:  added PCnetFast+ chip id
 *	   back port to 2.0.x
 * v1.00:  added some stuff from Donald Becker's 2.0.34 version
 *	   added support for byte counters in net_dev_stats
 * v1.01:  do ring dumps, only when debugging the driver
 *	   increased the transmit timeout
 * v1.02:  fixed memory leak in pcnet32_init_ring()
 * v1.10:  workaround for stopped transmitter
 *	   added port selection for modules
 *	   detect special T1/E1 WAN card and setup port selection
 * v1.11:  fixed wrong checking of Tx errors
 * v1.20:  added check of return value kmalloc ([e-mail])
 *	   added save original kmalloc addr for freeing ([e-mail])
 *	   added support for PCnetHome chip ([e-mail])
 *	   rewritten PCI card detection
 *	   added dwio mode to get driver working on some PPC machines
 * v1.21:  added mii selection and mii ioctl
 * v1.22:  changed pci scanning code to make PPC people happy
 *	   fixed switching to 32bit mode in pcnet32_open() (thanks
 *	   to Michael Richard <[e-mail]> for noticing this one)
 *	   added sub vendor/device id matching (thanks again to 
 *	   Michael Richard <[e-mail]>)
 *	   added chip id for 79c973/975 (thanks to Zach Brown <[e-mail]>)
 * v1.23   fixed small bug, when manual selecting MII speed/duplex
 * v1.24   Applied Thomas' patch to use TxStartPoint and thus decrease TxFIFO
 *	   underflows.	Added tx_start_pt module parameter. Increased
 *	   TX_RING_SIZE from 16 to 32.	Added #ifdef'd code to use DXSUFLO
 *	   for FAST[+] chipsets. <[e-mail]>
 * v1.24ac Added SMP spinlocking - Alan Cox <[e-mail]>
 * v1.25kf Added No Interrupt on successful Tx for some Tx's <[e-mail]>
 * v1.26   Converted to pci_alloc_consistent, Jamey Hicks / George France
 *                                           <[e-mail]>
 */


/*
 * Set the number of Tx and Rx buffers, using Log_2(# buffers).
 * Reasonable default values are 4 Tx buffers, and 16 Rx buffers.
 * That translates to 2 (4 == 2^^2) and 4 (16 == 2^^4).
 */
#ifndef PCNET32_LOG_TX_BUFFERS
#define PCNET32_LOG_TX_BUFFERS 4
#define PCNET32_LOG_RX_BUFFERS 5
#endif

#define TX_RING_SIZE			(1 << (PCNET32_LOG_TX_BUFFERS))
#define TX_RING_MOD_MASK		(TX_RING_SIZE - 1)
#define TX_RING_LEN_BITS		((PCNET32_LOG_TX_BUFFERS) << 12)

#define RX_RING_SIZE			(1 << (PCNET32_LOG_RX_BUFFERS))
#define RX_RING_MOD_MASK		(RX_RING_SIZE - 1)
#define RX_RING_LEN_BITS		((PCNET32_LOG_RX_BUFFERS) << 4)

#define PKT_BUF_SZ		1544

/* Offsets from base I/O address. */
#define PCNET32_WIO_RDP		0x10
#define PCNET32_WIO_RAP		0x12
#define PCNET32_WIO_RESET	0x14
#define PCNET32_WIO_BDP		0x16

#define PCNET32_DWIO_RDP	0x10
#define PCNET32_DWIO_RAP	0x14
#define PCNET32_DWIO_RESET	0x18
#define PCNET32_DWIO_BDP	0x1C

#define PCNET32_TOTAL_SIZE 0x20

/* some PCI ids */
#ifndef PCI_DEVICE_ID_AMD_LANCE
#define PCI_VENDOR_ID_AMD	      0x1022
#define PCI_DEVICE_ID_AMD_LANCE	      0x2000
#endif
#ifndef PCI_DEVICE_ID_AMD_PCNETHOME
#define PCI_DEVICE_ID_AMD_PCNETHOME   0x2001
#endif


#define CRC_POLYNOMIAL_LE 0xedb88320UL	/* Ethernet CRC, little endian */

/* The PCNET32 Rx and Tx ring descriptors. */
struct pcnet32_rx_head {
    u32 base;
    s16 buf_length;
    s16 status;	   
    u32 msg_length;
    u32 reserved;
};
	
struct pcnet32_tx_head {
    u32 base;
    s16 length;
    s16 status;
    u32 misc;
    u32 reserved;
};

/* The PCNET32 32-Bit initialization block, described in databook. */
struct pcnet32_init_block {
    u16 mode;
    u16 tlen_rlen;
    u8	phys_addr[6];
    u16 reserved;
    u32 filter[2];
    /* Receive and transmit ring base, along with extra bits. */    
    u32 rx_ring;
    u32 tx_ring;
};

/* PCnet32 access functions */
struct pcnet32_access {
    u16 (*read_csr)(unsigned long, int);
    void (*write_csr)(unsigned long, int, u16);
    u16 (*read_bcr)(unsigned long, int);
    void (*write_bcr)(unsigned long, int, u16);
    u16 (*read_rap)(unsigned long);
    void (*write_rap)(unsigned long, u16);
    void (*reset)(unsigned long);
};

/*
 * The first three fields of pcnet32_private are read by the ethernet device 
 * so we allocate the structure should be allocated by pci_alloc_consistent().
 */
struct pcnet32_private {
    /* The Tx and Rx ring entries must be aligned on 16-byte boundaries in 32bit mode. */
    struct pcnet32_rx_head   rx_ring[RX_RING_SIZE];
    struct pcnet32_tx_head   tx_ring[TX_RING_SIZE];
    struct pcnet32_init_block	init_block;
    dma_addr_t dma_addr;		/* DMA address of beginning of this object, returned by pci_alloc_consistent */
    struct pci_dev *pci_dev;		/* Pointer to the associated pci device structure */
    const char *name;
    /* The saved address of a sent-in-place packet/buffer, for skfree(). */
    struct sk_buff *tx_skbuff[TX_RING_SIZE];
    struct sk_buff *rx_skbuff[RX_RING_SIZE];
    dma_addr_t tx_dma_addr[TX_RING_SIZE];
    dma_addr_t rx_dma_addr[RX_RING_SIZE];
    struct pcnet32_access a;
    spinlock_t lock;					/* Guard lock */
    unsigned int cur_rx, cur_tx;		/* The next free ring entry */
    unsigned int dirty_rx, dirty_tx;	/* The ring entries to be free()ed. */
    struct net_device_stats stats;
    char tx_full;
    int	 options;
    int	 shared_irq:1,			/* shared irq possible */
	ltint:1,
#ifdef DO_DXSUFLO
	      dxsuflo:1,						    /* disable transmit stop on uflo */
#endif
	full_duplex:1,				/* full duplex possible */
	mii:1;					/* mii port available */
    struct net_device *next;
};

static int  pcnet32_probe_vlbus(int cards_found);
static int  pcnet32_probe_pci(struct pci_dev *, const struct pci_device_id *);
static int  pcnet32_probe1(unsigned long, unsigned char, int, int, struct pci_dev *);
static int  pcnet32_open(struct net_device *);
static int  pcnet32_init_ring(struct net_device *);
static int  pcnet32_start_xmit(struct sk_buff *, struct net_device *);
static int  pcnet32_rx(struct net_device *);
static void pcnet32_tx_timeout (struct net_device *dev);
static void pcnet32_interrupt(int, void *, struct pt_regs *);
static int  pcnet32_close(struct net_device *);
static struct net_device_stats *pcnet32_get_stats(struct net_device *);
static void pcnet32_set_multicast_list(struct net_device *);
#ifdef HAVE_PRIVATE_IOCTL
static int  pcnet32_mii_ioctl(struct net_device *, struct ifreq *, int);
#endif

enum pci_flags_bit {
    PCI_USES_IO=1, PCI_USES_MEM=2, PCI_USES_MASTER=4,
    PCI_ADDR0=0x10<<0, PCI_ADDR1=0x10<<1, PCI_ADDR2=0x10<<2, PCI_ADDR3=0x10<<3,
};

struct pcnet32_pci_id_info {
    const char *name;
    u16 vendor_id, device_id, svid, sdid, flags;
    int io_size;
    int (*probe1) (unsigned long, unsigned char, int, int, struct pci_dev *);
};


/*
 * PCI device identifiers for "new style" Linux PCI Device Drivers
 */
static struct pci_device_id pcnet32_pci_tbl[] __devinitdata = {
    { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_PCNETHOME, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
    { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
    { PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_LANCE, 0x1014, 0x2000, 0, 0, 0 },
    { 0, }
};

MODULE_DEVICE_TABLE (pci, pcnet32_pci_tbl);

static u16 pcnet32_wio_read_csr (unsigned long addr, int index)
{
    outw (index, addr+PCNET32_WIO_RAP);
    return inw (addr+PCNET32_WIO_RDP);
}

static void pcnet32_wio_write_csr (unsigned long addr, int index, u16 val)
{
    outw (index, addr+PCNET32_WIO_RAP);
    outw (val, addr+PCNET32_WIO_RDP);
}

static u16 pcnet32_wio_read_bcr (unsigned long addr, int index)
{
    outw (index, addr+PCNET32_WIO_RAP);
    return inw (addr+PCNET32_WIO_BDP);
}

static void pcnet32_wio_write_bcr (unsigned long addr, int index, u16 val)
{
    outw (index, addr+PCNET32_WIO_RAP);
    outw (val, addr+PCNET32_WIO_BDP);
}

static u16 pcnet32_wio_read_rap (unsigned long addr)
{
    return inw (addr+PCNET32_WIO_RAP);
}

static void pcnet32_wio_write_rap (unsigned long addr, u16 val)
{
    outw (val, addr+PCNET32_WIO_RAP);
}

static void pcnet32_wio_reset (unsigned long addr)
{
    inw (addr+PCNET32_WIO_RESET);
}

static int pcnet32_wio_check (unsigned long addr)
{
    outw (88, addr+PCNET32_WIO_RAP);
    return (inw (addr+PCNET32_WIO_RAP) == 88);
}

static struct pcnet32_access pcnet32_wio = {
    pcnet32_wio_read_csr,
    pcnet32_wio_write_csr,
    pcnet32_wio_read_bcr,
    pcnet32_wio_write_bcr,
    pcnet32_wio_read_rap,
    pcnet32_wio_write_rap,
    pcnet32_wio_reset
};

static u16 pcnet32_dwio_read_csr (unsigned long addr, int index)
{
    outl (index, addr+PCNET32_DWIO_RAP);
    return (inl (addr+PCNET32_DWIO_RDP) & 0xffff);
}

static void pcnet32_dwio_write_csr (unsigned long addr, int index, u16 val)
{
    outl (index, addr+PCNET32_DWIO_RAP);