smc9194.c

Linux Kernel 2.6.9 for OMAP1710

	 * when done.
	 */


	SMC_SELECT_BANK(2);
	/* enable ALLOCation interrupts ONLY */
	outb( IM_ALLOC_INT, ioaddr + INT_MASK );

	/*
 	 . Allocate 512 bytes of memory.  Note that the chip was just
	 . reset so all the memory is available
	*/
	smc_outw(MC_ALLOC | 1, ioaddr, MMU_CMD);

	/*
	 . Wait until positive that the interrupt has been generated
	*/
	while (timeout) {
		byte	int_status;

		int_status = smc_inb(ioaddr, INTERRUPT);

		if (int_status & IM_ALLOC_INT)
			break;		/* got the interrupt */
		timeout--;
	}
	/* there is really nothing that I can do here if timeout fails,
	   as autoirq_report will return a 0 anyway, which is what I
	   want in this case.   Plus, the clean up is needed in both
	   cases.  */

	/* DELAY HERE!
	   On a fast machine, the status might change before the interrupt
	   is given to the processor.  This means that the interrupt was
	   never detected, and autoirq_report fails to report anything.
	   This should fix autoirq_* problems.
	*/
	SMC_DELAY();
	SMC_DELAY();

	/* and disable all interrupts again */
	outb( 0, ioaddr + INT_MASK );

	/* clear hardware interrupts again, because that's how it
	   was when I was called... */
	cli();

	/* and return what I found */
	return probe_irq_off(cookie);
#else /* NO_AUTOPROBE */
	struct devlist *smcdev;
	for (smcdev = smc_devlist; smcdev->port; smcdev++) {
		if (smcdev->port == ioaddr)
			return smcdev->irq;
	}
	return 0;
#endif
}

/*----------------------------------------------------------------------
 . Function: smc_probe( int ioaddr )
 .
 . Purpose:
 .	Tests to see if a given ioaddr points to an SMC9xxx chip.
 .	Returns a 0 on success
 .
 . Algorithm:
 .	(1) see if the high byte of BANK_SELECT is 0x33
 . 	(2) compare the ioaddr with the base register's address
 .	(3) see if I recognize the chip ID in the appropriate register
 .
 .---------------------------------------------------------------------
 */

/*---------------------------------------------------------------
 . 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
 .-----------------------------------------------------------------
*/
static int __init smc_probe(struct net_device *dev, int ioaddr)
{
	int i, memory, retval;
	static unsigned version_printed;
	unsigned int bank;

	const char *version_string;
	const char *if_string;

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

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

	dev->irq = irq;
	dev->if_port = ifport;

	/* First, see if the high byte is 0x33 */
	bank = inw( ioaddr + BANK_SELECT );
	if ( (bank & 0xFF00) != 0x3300 ) {
		retval = -ENODEV;
		goto err_out;
	}
	/* 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 ) {
		retval = -ENODEV;
		goto err_out;
	}
#if !defined(CONFIG_H8S_EDOSK2674)
	/* 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. */
		retval = -ENODEV;
		goto err_out;
	}
#else
	(void)base_address_register; /* Warning suppression */
#endif


	/*  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 = smc_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 );

		retval = -ENODEV;
		goto err_out;
	}

	/* 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. */

	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 = smc_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 = smc_inw(ioaddr, MIR);
	memory_cfg_register = smc_inw(ioaddr, MCR);
	memory = (memory_cfg_register >> 9) & 0x7;  /* multiplier */
	memory *= 256 * (memory_info_register & 0xFF);
	memory = ( memory_cfg_register >> 9 )  & 0x7;  /* multiplier */

	/*
	 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.... */
		retval = -ENODEV;
		goto err_out;
	}

	/* 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!!!!
 	 .
	*/
	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");
		retval = -ENODEV;
		goto err_out;
	}

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

	printk("%s: %s(r:%d) at %#3x IRQ:%d INTF:%s MEM:%db ", dev->name,
		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] );

	/* set the private data to zero by default */
	memset(dev->priv, 0, sizeof(struct smc_local));

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

	dev->open		        = smc_open;
	dev->stop		        = smc_close;
	dev->hard_start_xmit    	= smc_wait_to_send_packet;
	dev->tx_timeout		    	= smc_timeout;
	dev->watchdog_timeo		= HZ/20;
	dev->get_stats			= smc_query_statistics;
	dev->set_multicast_list 	= smc_set_multicast_list;

	return 0;

err_out:
	release_region(ioaddr, SMC_IO_EXTENT);
	return retval;
}

#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 net_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));

	/* 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...
	*/
		address  |= dev->dev_addr[ i ];
	netif_start_queue(dev);
	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 void smc_timeout(struct net_device *dev)
{
	/* If we get here, some higher level has decided we are broken.
	   There should really be a "kick me" function call instead. */
	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->trans_start = jiffies;
	/* clear anything saved */
	((struct smc_local *)dev->priv)->saved_skb = NULL;
	netif_wake_queue(dev);
}

/*-------------------------------------------------------------
 .
 . smc_rcv -  receive a packet from the card
 .
 . There is ( at least ) a packet waiting to be read from
 . chip-memory.
 .
 . o Read the status
 . o If an error, record it
 . o otherwise, read in the packet
 --------------------------------------------------------------
*/
static void smc_rcv(struct net_device *dev)
{
	struct smc_local *lp = netdev_priv(dev);
	int 	ioaddr = dev->base_addr;
	int 	packet_number;
	word	status;
	word	packet_length;

	/* assume bank 2 */

	packet_number = inw( ioaddr + FIFO_PORTS );

	if ( packet_number & FP_RXEMPTY ) {
		/* we got called , but nothing was on the FIFO */
		PRINTK((CARDNAME ": WARNING: smc_rcv with nothing on FIFO. \n"));
		/* don't need to restore anything */
		return;
	}

	/*  start reading from the start of the packet */
	outw( PTR_READ | PTR_RCV | PTR_AUTOINC, ioaddr + POINTER );