smc9194.c

powerpc内核mpc8241linux系统下net驱动程序

		return -ENODEV;
	}
	/* The above MIGHT indicate a device, but I need to write to further
 	 	test this.  */
	outw( 0x0, ioaddr + BANK_SELECT );
	bank = inw( ioaddr + BANK_SELECT );
	if ( (bank & 0xFF00 ) != 0x3300 ) {
		return -ENODEV;
	}
	/* well, we've already written once, so hopefully another time won't
 	   hurt.  This time, I need to switch the bank register to bank 1,
	   so I can access the base address register */
	SMC_SELECT_BANK(1);
	base_address_register = inw( ioaddr + BASE );
	if ( ioaddr != ( base_address_register >> 3 & 0x3E0 ) )  {
		printk(CARDNAME ": IOADDR %x doesn't match configuration (%x)."
			"Probably not a SMC chip\n",
			ioaddr, base_address_register >> 3 & 0x3E0 );
		/* well, the base address register didn't match.  Must not have
		   been a SMC chip after all. */
		return -ENODEV;
	}

	/*  check if the revision register is something that I recognize.
	    These might need to be added to later, as future revisions
	    could be added.  */
	SMC_SELECT_BANK(3);
	revision_register  = inw( ioaddr + REVISION );
	if ( !chip_ids[ ( revision_register  >> 4 ) & 0xF  ] ) {
		/* I don't recognize this chip, so... */
		printk(CARDNAME ": IO %x: Unrecognized revision register:"
			" %x, Contact author. \n", ioaddr, revision_register );

		return -ENODEV;
	}

	/* at this point I'll assume that the chip is an SMC9xxx.
	   It might be prudent to check a listing of MAC addresses
	   against the hardware address, or do some other tests. */
	return 0;
}

/*---------------------------------------------------------------
 . Here I do typical initialization tasks.
 .
 . o  Initialize the structure if needed
 . o  print out my vanity message if not done so already
 . o  print out what type of hardware is detected
 . o  print out the ethernet address
 . o  find the IRQ
 . o  set up my private data
 . o  configure the dev structure with my subroutines
 . o  actually GRAB the irq.
 . o  GRAB the region
 .-----------------------------------------------------------------
*/
__initfunc(static int  smc_initcard(struct device *dev, int ioaddr))
{
	int i;

	static unsigned version_printed = 0;

	/* registers */
	word	revision_register;
	word	configuration_register;
	word  	memory_info_register;
	word 	memory_cfg_register;

	const char *	version_string;
	const char *	if_string;
	int	memory;

	int   irqval;

	/* see if I need to initialize the ethernet card structure */
	if (dev == NULL) {
#ifdef SUPPORT_OLD_KERNEL
#ifndef MODULE
/* note: the old module interface does not support this call */
		dev = init_etherdev( 0, sizeof( struct smc_local ), 0 );
#endif
#else
		dev = init_etherdev(0, 0);
#endif
		if (dev == NULL)
			return -ENOMEM;
	}

	if (version_printed++ == 0)
		printk("%s", version);

	/* fill in some of the fields */
	dev->base_addr = ioaddr;

	/*
 	 . Get the MAC address ( bank 1, regs 4 - 9 )
	*/
	SMC_SELECT_BANK( 1 );
	for ( i = 0; i < 6; i += 2 ) {
		word	address;

		address = inw( ioaddr + ADDR0 + i  );
		dev->dev_addr[ i + 1] = address >> 8;
		dev->dev_addr[ i ] = address & 0xFF;
	}

	/* get the memory information */

	SMC_SELECT_BANK( 0 );
	memory_info_register = inw( ioaddr + MIR );
	memory_cfg_register  = inw( ioaddr + MCR );
	memory = ( memory_cfg_register >> 9 )  & 0x7;  /* multiplier */
	memory *= 256 * ( memory_info_register & 0xFF );

	/*
	 Now, I want to find out more about the chip.  This is sort of
 	 redundant, but it's cleaner to have it in both, rather than having
 	 one VERY long probe procedure.
	*/
	SMC_SELECT_BANK(3);
	revision_register  = inw( ioaddr + REVISION );
	version_string = chip_ids[ ( revision_register  >> 4 ) & 0xF  ];
	if ( !version_string ) {
		/* I shouldn't get here because this call was done before.... */
		return -ENODEV;
	}

	/* is it using AUI or 10BaseT ? */
	if ( dev->if_port == 0 ) {
		SMC_SELECT_BANK(1);
		configuration_register = inw( ioaddr + CONFIG );
		if ( configuration_register & CFG_AUI_SELECT )
			dev->if_port = 2;
		else
			dev->if_port = 1;
	}
	if_string = interfaces[ dev->if_port - 1 ];

	/* now, reset the chip, and put it into a known state */
	smc_reset( ioaddr );

	/*
	 . If dev->irq is 0, then the device has to be banged on to see
	 . what the IRQ is.
 	 .
	 . This banging doesn't always detect the IRQ, for unknown reasons.
	 . a workaround is to reset the chip and try again.
	 .
	 . Interestingly, the DOS packet driver *SETS* the IRQ on the card to
	 . be what is requested on the command line.   I don't do that, mostly
	 . because the card that I have uses a non-standard method of accessing
	 . the IRQs, and because this _should_ work in most configurations.
	 .
	 . Specifying an IRQ is done with the assumption that the user knows
	 . what (s)he is doing.  No checking is done!!!!
 	 .
	*/
#ifndef NO_AUTOPROBE
	if ( dev->irq < 2 ) {
		int	trials;

		trials = 3;
		while ( trials-- ) {
			dev->irq = smc_findirq( ioaddr );
			if ( dev->irq )
				break;
			/* kick the card and try again */
			smc_reset( ioaddr );
		}
	}
	if (dev->irq == 0 ) {
		printk(CARDNAME": Couldn't autodetect your IRQ. Use irq=xx.\n");
		return -ENODEV;
	}
#else
	if (dev->irq == 0 ) {
		printk(CARDNAME
		": Autoprobing IRQs is not supported for old kernels.\n");
		return -ENODEV;
	}
#endif
	if (dev->irq == 2) {
		/* Fixup for users that don't know that IRQ 2 is really IRQ 9,
		 * or don't know which one to set.
		 */
		dev->irq = 9;
	}

	/* now, print out the card info, in a short format.. */

	printk(CARDNAME ": %s(r:%d) at %#3x IRQ:%d INTF:%s MEM:%db ",
		version_string, revision_register & 0xF, ioaddr, dev->irq,
		if_string, memory );
	/*
	 . Print the Ethernet address
	*/
	printk("ADDR: ");
	for (i = 0; i < 5; i++)
		printk("%2.2x:", dev->dev_addr[i] );
	printk("%2.2x \n", dev->dev_addr[5] );


	/* Initialize the private structure. */
	if (dev->priv == NULL) {
		dev->priv = kmalloc(sizeof(struct smc_local), GFP_KERNEL);
		if (dev->priv == NULL)
			return -ENOMEM;
	}
	/* set the private data to zero by default */
	memset(dev->priv, 0, sizeof(struct smc_local));

	/* Fill in the fields of the device structure with ethernet values. */
	ether_setup(dev);

	/* Grab the IRQ */
      	irqval = request_irq(dev->irq, &smc_interrupt, 0, CARDNAME, dev);
      	if (irqval) {
       	  printk(CARDNAME": unable to get IRQ %d (irqval=%d).\n",
		dev->irq, irqval);
       	  return -EAGAIN;
      	}

	/* Grab the region so that no one else tries to probe our ioports. */
	request_region(ioaddr, SMC_IO_EXTENT, CARDNAME);

	dev->open		        = smc_open;
	dev->stop		        = smc_close;
	dev->hard_start_xmit    	= smc_send_packet;
	dev->get_stats			= smc_query_statistics;
#ifdef	HAVE_MULTICAST
	dev->set_multicast_list 	= &smc_set_multicast_list;
#endif

	return 0;
}

#if SMC_DEBUG > 2
static void print_packet( byte * buf, int length )
{
#if 0
	int i;
	int remainder;
	int lines;

	printk("Packet of length %d \n", length );
	lines = length / 16;
	remainder = length % 16;

	for ( i = 0; i < lines ; i ++ ) {
		int cur;

		for ( cur = 0; cur < 8; cur ++ ) {
			byte a, b;

			a = *(buf ++ );
			b = *(buf ++ );
			printk("%02x%02x ", a, b );
		}
		printk("\n");
	}
	for ( i = 0; i < remainder/2 ; i++ ) {
		byte a, b;

		a = *(buf ++ );
		b = *(buf ++ );
		printk("%02x%02x ", a, b );
	}
	printk("\n");
#endif
}
#endif


/*
 * Open and Initialize the board
 *
 * Set up everything, reset the card, etc ..
 *
 */
static int smc_open(struct device *dev)
{
	int	ioaddr = dev->base_addr;

	int	i;	/* used to set hw ethernet address */

	/* clear out all the junk that was put here before... */
	memset(dev->priv, 0, sizeof(struct smc_local));

	dev->tbusy 	= 0;
	dev->interrupt  = 0;
	dev->start 	= 1;
#ifdef MODULE
	MOD_INC_USE_COUNT;
#endif

	/* reset the hardware */

	smc_reset( ioaddr );
	smc_enable( ioaddr );

	/* Select which interface to use */

	SMC_SELECT_BANK( 1 );
	if ( dev->if_port == 1 ) {
		outw( inw( ioaddr + CONFIG ) & ~CFG_AUI_SELECT,
			ioaddr + CONFIG );
	}
	else if ( dev->if_port == 2 ) {
		outw( inw( ioaddr + CONFIG ) | CFG_AUI_SELECT,
			ioaddr + CONFIG );
	}

	/*
  		According to Becker, I have to set the hardware address
		at this point, because the (l)user can set it with an
		ioctl.  Easily done...
	*/
	SMC_SELECT_BANK( 1 );
	for ( i = 0; i < 6; i += 2 ) {
		word	address;

		address = dev->dev_addr[ i + 1 ] << 8 ;
		address  |= dev->dev_addr[ i ];
		outw( address, ioaddr + ADDR0 + i );
	}
	return 0;
}

/*--------------------------------------------------------
 . Called by the kernel to send a packet out into the void
 . of the net.  This routine is largely based on
 . skeleton.c, from Becker.
 .--------------------------------------------------------
*/
static int smc_send_packet(struct sk_buff *skb, struct device *dev)
{
	if (dev->tbusy) {
		/* If we get here, some higher level has decided we are broken.
		   There should really be a "kick me" function call instead. */
		int tickssofar = jiffies - dev->trans_start;
		if (tickssofar < 5)
			return 1;
		printk(KERN_WARNING CARDNAME": transmit timed out, %s?\n",
			tx_done(dev) ? "IRQ conflict" :
			"network cable problem");
		/* "kick" the adaptor */
		smc_reset( dev->base_addr );
		smc_enable( dev->base_addr );

		dev->tbusy = 0;
		dev->trans_start = jiffies;
		/* clear anything saved */
		((struct smc_local *)dev->priv)->saved_skb = NULL;
	}

	/* Block a timer-based transmit from overlapping.  This could better be
	   done with atomic_swap(1, dev->tbusy), but set_bit() works as well. */
	if (test_and_set_bit(0, (void*)&dev->tbusy) != 0) {
		printk(KERN_WARNING CARDNAME": Transmitter access conflict.\n");
		dev_kfree_skb (skb);
	} else {
		/* Well, I want to send the packet.. but I don't know
		   if I can send it right now...  */
		return smc_wait_to_send_packet( skb, dev );
	}
	return 0;
}

/*--------------------------------------------------------------------
 .
 . This is the main routine of the driver, to handle the device when
 . it needs some attention.
 .
 . So:
 .   first, save state of the chipset
 .   branch off into routines to handle each case, and acknowledge
 .	    each to the interrupt register
 .   and finally restore state.
 .
 ---------------------------------------------------------------------*/
#ifdef REALLY_NEW_KERNEL
static void smc_interrupt(int irq, void * dev_id,  struct pt_regs * regs)
#else
static void smc_interrupt(int irq, struct pt_regs * regs)
#endif
{
	struct device *dev 	= dev_id;
	int ioaddr 		= dev->base_addr;
	struct smc_local *lp 	= (struct smc_local *)dev->priv;

	byte	status;
	word	card_stats;
	byte	mask;
	int	timeout;
	/* state registers */
	word	saved_bank;
	word	saved_pointer;



	PRINTK3((CARDNAME": SMC interrupt started \n"));

	if (dev == NULL) {
		printk(KERN_WARNING  CARDNAME": irq %d for unknown device.\n",
			irq);
		return;
	}

/* will Linux let this happen ??  If not, this costs some speed */
	if ( dev->interrupt ) {
		printk(KERN_WARNING CARDNAME": interrupt inside interrupt.\n");
		return;
	}

	dev->interrupt = 1;

	saved_bank = inw( ioaddr + BANK_SELECT );

	SMC_SELECT_BANK(2);
	saved_pointer = inw( ioaddr + POINTER );

	mask = inb( ioaddr + INT_MASK );
	/* clear all interrupts */
	outb( 0, ioaddr + INT_MASK );


	/* set a timeout value, so I don't stay here forever */
	timeout = 4;

	PRINTK2((KERN_WARNING CARDNAME ": MASK IS %x \n", mask ));
	do {
		/* read the status flag, and mask it */
		status = inb( ioaddr + INTERRUPT ) & mask;
		if (!status )
			break;

		PRINTK3((KERN_WARNING CARDNAME
			": Handling interrupt status %x \n", status ));

		if (status & IM_RCV_INT) {
			/* Got a packet(s). */
			PRINTK2((KERN_WARNING CARDNAME
				": Receive Interrupt\n"));
			smc_rcv(dev);