cs89x0.c

powerpc内核mpc8241linux系统下net驱动程序

/* cs89x0.c: A Crystal Semiconductor CS89[02]0 driver for linux. */
/*
	Written 1996 by Russell Nelson, with reference to skeleton.c
	written 1993-1994 by Donald Becker.

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

	The author may be reached at [e-mail], Crynwr
	Software, 11 Grant St., Potsdam, NY 13676

  Changelog:

  Mike Cruse        : [e-mail]
                    : Changes for Linux 2.0 compatibility. 
                    : Added dev_id parameter in net_interrupt(),
                    : request_irq() and free_irq(). Just NULL for now.

  Mike Cruse        : Added MOD_INC_USE_COUNT and MOD_DEC_USE_COUNT macros
                    : in net_open() and net_close() so kerneld would know
                    : that the module is in use and wouldn't eject the 
                    : driver prematurely.

  Mike Cruse        : Rewrote init_module() and cleanup_module using 8390.c
                    : as an example. Disabled autoprobing in init_module(),
                    : not a good thing to do to other devices while Linux
                    : is running from all accounts.
                    
  Alan Cox          : Removed 1.2 support, added 2.1 extra counters.
*/

static char *version =
"cs89x0.c:v1.02 11/26/96 Russell Nelson <[e-mail]>\n";

/* ======================= configure the driver here ======================= */

/* use 0 for production, 1 for verification, >2 for debug */
#ifndef NET_DEBUG
#define NET_DEBUG 2
#endif

/* ======================= end of configuration ======================= */


/* Always include 'config.h' first in case the user wants to turn on
   or override something. */
#ifdef MODULE
#include <linux/module.h>
#include <linux/version.h>
#else
#define MOD_INC_USE_COUNT
#define MOD_DEC_USE_COUNT
#endif

#define PRINTK(x) printk x

/*
  Sources:

	Crynwr packet driver epktisa.

	Crystal Semiconductor data sheets.

*/

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <linux/errno.h>
#include <linux/init.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include "cs89x0.h"

/* First, a few definitions that the brave might change. */
/* A zero-terminated list of I/O addresses to be probed. */
static unsigned int netcard_portlist[] __initdata =
   { 0x300, 0x320, 0x340, 0x200, 0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x2e0, 0};

static unsigned int net_debug = NET_DEBUG;

/* The number of low I/O ports used by the ethercard. */
#define NETCARD_IO_EXTENT	16

/* Information that need to be kept for each board. */
struct net_local {
	struct net_device_stats stats;
	int chip_type;		/* one of: CS8900, CS8920, CS8920M */
	char chip_revision;	/* revision letter of the chip ('A'...) */
	int send_cmd;		/* the propercommand used to send a packet. */
	int auto_neg_cnf;
	int adapter_cnf;
	int isa_config;
	int irq_map;
	int rx_mode;
	int curr_rx_cfg;
        int linectl;
        int send_underrun;      /* keep track of how many underruns in a row we get */
	struct sk_buff *skb;
};

/* Index to functions, as function prototypes. */

extern int cs89x0_probe(struct device *dev);

static int cs89x0_probe1(struct device *dev, int ioaddr);
static int net_open(struct device *dev);
static int	net_send_packet(struct sk_buff *skb, struct device *dev);
static void net_interrupt(int irq, void *dev_id, struct pt_regs *regs);
static void set_multicast_list(struct device *dev);
static void net_rx(struct device *dev);
static int net_close(struct device *dev);
static struct net_device_stats *net_get_stats(struct device *dev);
static void reset_chip(struct device *dev);
static int get_eeprom_data(struct device *dev, int off, int len, int *buffer);
static int get_eeprom_cksum(int off, int len, int *buffer);
static int set_mac_address(struct device *dev, void *addr);


/* Example routines you must write ;->. */
#define tx_done(dev) 1


/* Check for a network adaptor of this type, and return '0' iff one exists.
   If dev->base_addr == 0, probe all likely locations.
   If dev->base_addr == 1, always return failure.
   If dev->base_addr == 2, allocate space for the device and return success
   (detachable devices only).
   */
#ifdef HAVE_DEVLIST
/* Support for a alternate probe manager, which will eliminate the
   boilerplate below. */
struct netdev_entry netcard_drv =
{"netcard", cs89x0_probe1, NETCARD_IO_EXTENT, netcard_portlist};
#else
__initfunc(int
cs89x0_probe(struct device *dev))
{
	int i;
	int base_addr = dev ? dev->base_addr : 0;

	if (base_addr > 0x1ff)		/* Check a single specified location. */
		return cs89x0_probe1(dev, base_addr);
	else if (base_addr != 0)	/* Don't probe at all. */
		return ENXIO;

	for (i = 0; netcard_portlist[i]; i++) {
		int ioaddr = netcard_portlist[i];
		if (check_region(ioaddr, NETCARD_IO_EXTENT))
			continue;
		if (cs89x0_probe1(dev, ioaddr) == 0)
			return 0;
	}
	printk("cs89x0: no cs8900 or cs8920 detected.  Be sure to disable PnP with SETUP\n");
	return ENODEV;
}
#endif

static int inline
readreg(struct device *dev, int portno)
{
	outw(portno, dev->base_addr + ADD_PORT);
	return inw(dev->base_addr + DATA_PORT);
}

static void inline
writereg(struct device *dev, int portno, int value)
{
	outw(portno, dev->base_addr + ADD_PORT);
	outw(value, dev->base_addr + DATA_PORT);
}


static int inline
readword(struct device *dev, int portno)
{
	return inw(dev->base_addr + portno);
}

static void inline
writeword(struct device *dev, int portno, int value)
{
	outw(value, dev->base_addr + portno);
}

__initfunc(static int
wait_eeprom_ready(struct device *dev))
{
	int timeout = jiffies;
	/* check to see if the EEPROM is ready, a timeout is used -
	   just in case EEPROM is ready when SI_BUSY in the
	   PP_SelfST is clear */
	while(readreg(dev, PP_SelfST) & SI_BUSY)
		if (jiffies - timeout >= 40)
			return -1;
	return 0;
}

__initfunc(static int
get_eeprom_data(struct device *dev, int off, int len, int *buffer))
{
	int i;

	if (net_debug > 3) printk("EEPROM data from %x for %x:\n",off,len);
	for (i = 0; i < len; i++) {
		if (wait_eeprom_ready(dev) < 0) return -1;
		/* Now send the EEPROM read command and EEPROM location to read */
		writereg(dev, PP_EECMD, (off + i) | EEPROM_READ_CMD);
		if (wait_eeprom_ready(dev) < 0) return -1;
		buffer[i] = readreg(dev, PP_EEData);
		if (net_debug > 3) printk("%04x ", buffer[i]);
	}
	if (net_debug > 3) printk("\n");
        return 0;
}

__initfunc(static int
get_eeprom_cksum(int off, int len, int *buffer))
{
	int i, cksum;

	cksum = 0;
	for (i = 0; i < len; i++)
		cksum += buffer[i];
	cksum &= 0xffff;
	if (cksum == 0)
		return 0;
	return -1;
}

/* This is the real probe routine.  Linux has a history of friendly device
   probes on the ISA bus.  A good device probes avoids doing writes, and
   verifies that the correct device exists and functions.  */

__initfunc(static int cs89x0_probe1(struct device *dev, int ioaddr))
{
	struct net_local *lp;
	static unsigned version_printed = 0;
	int i;
	unsigned rev_type = 0;
	int eeprom_buff[CHKSUM_LEN];

	/* Initialize the device structure. */
	if (dev->priv == NULL) {
		dev->priv = kmalloc(sizeof(struct net_local), GFP_KERNEL);
                memset(dev->priv, 0, sizeof(struct net_local));
        }
	lp = (struct net_local *)dev->priv;

	/* if they give us an odd I/O address, then do ONE write to
           the address port, to get it back to address zero, where we
           expect to find the EISA signature word. */
	if (ioaddr & 1) {
		ioaddr &= ~1;
		if ((inw(ioaddr + ADD_PORT) & ADD_MASK) != ADD_SIG)
			return ENODEV;
		outw(PP_ChipID, ioaddr + ADD_PORT);
	}

	if (inw(ioaddr + DATA_PORT) != CHIP_EISA_ID_SIG)
		return ENODEV;

	/* Fill in the 'dev' fields. */
	dev->base_addr = ioaddr;

	/* get the chip type */
	rev_type = readreg(dev, PRODUCT_ID_ADD);
	lp->chip_type = rev_type &~ REVISON_BITS;
	lp->chip_revision = ((rev_type & REVISON_BITS) >> 8) + 'A';

	/* Check the chip type and revision in order to set the correct send command
	CS8920 revision C and CS8900 revision F can use the faster send. */
	lp->send_cmd = TX_AFTER_381;
	if (lp->chip_type == CS8900 && lp->chip_revision >= 'F')
		lp->send_cmd = TX_NOW;
	if (lp->chip_type != CS8900 && lp->chip_revision >= 'C')
		lp->send_cmd = TX_NOW;

	if (net_debug  &&  version_printed++ == 0)
		printk(version);

	printk("%s: cs89%c0%s rev %c found at %#3lx",
	       dev->name,
	       lp->chip_type==CS8900?'0':'2',
	       lp->chip_type==CS8920M?"M":"",
	       lp->chip_revision,
	       dev->base_addr);

	reset_chip(dev);

	/* First check to see if an EEPROM is attached*/
	if ((readreg(dev, PP_SelfST) & EEPROM_PRESENT) == 0)
		printk("\ncs89x0: No EEPROM, relying on command line....\n");
	else if (get_eeprom_data(dev, START_EEPROM_DATA,CHKSUM_LEN,eeprom_buff) < 0) {
		printk("\ncs89x0: EEPROM read failed, relying on command line.\n");
        } else if (get_eeprom_cksum(START_EEPROM_DATA,CHKSUM_LEN,eeprom_buff) < 0) {
                printk("\ncs89x0: EEPROM checksum bad, relyong on command line\n");
        } else {
                /* get transmission control word  but keep the autonegotiation bits */
                if (!lp->auto_neg_cnf) lp->auto_neg_cnf = eeprom_buff[AUTO_NEG_CNF_OFFSET/2];
                /* Store adapter configuration */
                if (!lp->adapter_cnf) lp->adapter_cnf = eeprom_buff[ADAPTER_CNF_OFFSET/2];
                /* Store ISA configuration */
                lp->isa_config = eeprom_buff[ISA_CNF_OFFSET/2];
                /* store the initial memory base address */
                dev->mem_start = eeprom_buff[PACKET_PAGE_OFFSET/2] << 8;
                for (i = 0; i < ETH_ALEN/2; i++) {
                        dev->dev_addr[i*2] = eeprom_buff[i];
                        dev->dev_addr[i*2+1] = eeprom_buff[i] >> 8;
                }
        }


	printk(" media %s%s%s",
	       (lp->adapter_cnf & A_CNF_10B_T)?"RJ-45,":"",
	       (lp->adapter_cnf & A_CNF_AUI)?"AUI,":"",
	       (lp->adapter_cnf & A_CNF_10B_2)?"BNC,":"");

	lp->irq_map = 0xffff;

	/* If this is a CS8900 then no pnp soft */
	if (lp->chip_type != CS8900 &&
	    /* Check if the ISA IRQ has been set  */
		(i = readreg(dev, PP_CS8920_ISAINT) & 0xff,
		 (i != 0 && i < CS8920_NO_INTS))) {
		if (!dev->irq)
			dev->irq = i;
	} else {
		i = lp->isa_config & INT_NO_MASK;
		if (lp->chip_type == CS8900) {
			/* the table that follows is dependent upon how you wired up your cs8900
			 * in your system.  The table is the same as the cs8900 engineering demo
			 * board.  irq_map also depends on the contents of the table.  Also see
			 * write_irq, which is the reverse mapping of the table below. */
			switch(i) {
			case 0: i = 10; break;
			case 1: i = 11; break;
			case 2: i = 12; break;
			case 3: i =  5; break;
			default: printk("\ncs89x0: bug: isa_config is %d\n", i);
			}
			lp->irq_map = CS8900_IRQ_MAP; /* fixed IRQ map for CS8900 */
		} else {
			int irq_map_buff[IRQ_MAP_LEN/2];

			if (get_eeprom_data(dev, IRQ_MAP_EEPROM_DATA,
					    IRQ_MAP_LEN/2,
					    irq_map_buff) >= 0) {
				if ((irq_map_buff[0] & 0xff) == PNP_IRQ_FRMT)
					lp->irq_map = (irq_map_buff[0]>>8) | (irq_map_buff[1] << 8);
			}
		}
		if (!dev->irq)
			dev->irq = i;
	}