fec.c

来自「Linux Kernel 2.6.9 for OMAP1710」· C语言 代码 · 共 1,975 行 · 第 1/4 页

fec_enet_open(struct net_device *dev)
{
	struct fec_enet_private *fep = netdev_priv(dev);

	/* I should reset the ring buffers here, but I don't yet know
	 * a simple way to do that.
	 */

	fec_set_mac_address(dev);

	fep->sequence_done = 0;
	fep->link = 0;

	if (fep->phy) {
		mii_do_cmd(dev, fep->phy->ack_int);
		mii_do_cmd(dev, fep->phy->config);
		mii_do_cmd(dev, phy_cmd_config);  /* display configuration */

		/* FIXME: use netif_carrier_{on,off} ; this polls
		 * until link is up which is wrong...  could be
		 * 30 seconds or more we are trapped in here. -jgarzik
		 */
		while(!fep->sequence_done)
			schedule();

		mii_do_cmd(dev, fep->phy->startup);
	} else {
		fep->link = 1; /* lets just try it and see */
		/* no phy,  go full duplex,  it's most likely a hub chip */
		fec_restart(dev, 1);
	}

	netif_start_queue(dev);
	opened = 1;
	return 0;		/* Success */
}

static int
fec_enet_close(struct net_device *dev)
{
	/* Don't know what to do yet.
	*/
	opened = 0;
	netif_stop_queue(dev);
	fec_stop(dev);

	return 0;
}

static struct net_device_stats *fec_enet_get_stats(struct net_device *dev)
{
	struct fec_enet_private *fep = netdev_priv(dev);

	return &fep->stats;
}

/* Set or clear the multicast filter for this adaptor.
 * Skeleton taken from sunlance driver.
 * The CPM Ethernet implementation allows Multicast as well as individual
 * MAC address filtering.  Some of the drivers check to make sure it is
 * a group multicast address, and discard those that are not.  I guess I
 * will do the same for now, but just remove the test if you want
 * individual filtering as well (do the upper net layers want or support
 * this kind of feature?).
 */

#define HASH_BITS	6		/* #bits in hash */
#define CRC32_POLY	0xEDB88320

static void set_multicast_list(struct net_device *dev)
{
	struct fec_enet_private *fep;
	volatile fec_t *ep;
	struct dev_mc_list *dmi;
	unsigned int i, j, bit, data, crc;
	unsigned char hash;

	fep = netdev_priv(dev);
	ep = fec_hwp;

	if (dev->flags&IFF_PROMISC) {
		/* Log any net taps. */
		printk("%s: Promiscuous mode enabled.\n", dev->name);
		ep->fec_r_cntrl |= 0x0008;
	} else {

		ep->fec_r_cntrl &= ~0x0008;

		if (dev->flags & IFF_ALLMULTI) {
			/* Catch all multicast addresses, so set the
			 * filter to all 1's.
			 */
			ep->fec_hash_table_high = 0xffffffff;
			ep->fec_hash_table_low = 0xffffffff;
		} else {
			/* Clear filter and add the addresses in hash register.
			*/
			ep->fec_hash_table_high = 0;
			ep->fec_hash_table_low = 0;
            
			dmi = dev->mc_list;

			for (j = 0; j < dev->mc_count; j++, dmi = dmi->next)
			{
				/* Only support group multicast for now.
				*/
				if (!(dmi->dmi_addr[0] & 1))
					continue;
			
				/* calculate crc32 value of mac address
				*/
				crc = 0xffffffff;

				for (i = 0; i < dmi->dmi_addrlen; i++)
				{
					data = dmi->dmi_addr[i];
					for (bit = 0; bit < 8; bit++, data >>= 1)
					{
						crc = (crc >> 1) ^
						(((crc ^ data) & 1) ? CRC32_POLY : 0);
					}
				}

				/* only upper 6 bits (HASH_BITS) are used
				   which point to specific bit in he hash registers
				*/
				hash = (crc >> (32 - HASH_BITS)) & 0x3f;
			
				if (hash > 31)
					ep->fec_hash_table_high |= 1 << (hash - 32);
				else
					ep->fec_hash_table_low |= 1 << hash;
			}
		}
	}
}

/* Set a MAC change in hardware.
 */
static void
fec_set_mac_address(struct net_device *dev)
{
	int i;
	volatile fec_t *fecp;

	fecp = fec_hwp;

	/* Set our copy of the Ethernet address */
	for (i = 0; i < (ETH_ALEN / 2); i++)
		my_enet_addr[i] = (dev->dev_addr[i*2] << 8) | dev->dev_addr[i*2 + 1];

	/* Set station address. */
	fecp->fec_addr_low = (my_enet_addr[0] << 16) | my_enet_addr[1];
	fecp->fec_addr_high = my_enet_addr[2] << 16;
}

/* Initialize the FEC Ethernet on 860T (or ColdFire 5272).
 */
 /*
  * XXX:  We need to clean up on failure exits here.
  */
int __init fec_enet_init(struct net_device *dev)
{
	struct fec_enet_private *fep = netdev_priv(dev);
	unsigned long	mem_addr;
	volatile cbd_t	*bdp;
	cbd_t		*cbd_base;
	volatile fec_t	*fecp;
	int 		i, j;

	/* Only allow us to be probed once. */
	if (found)
		return(-ENXIO);

	/* Create an Ethernet device instance.
	*/
	fecp = fec_hwp;

	/* Whack a reset.  We should wait for this.
	*/
	fecp->fec_ecntrl = 1;
	udelay(10);

	/* Clear and enable interrupts */
	fecp->fec_ievent = 0xffc0;
	fecp->fec_imask = (FEC_ENET_TXF | FEC_ENET_TXB |
		FEC_ENET_RXF | FEC_ENET_RXB | FEC_ENET_MII);
	fecp->fec_hash_table_high = 0;
	fecp->fec_hash_table_low = 0;
	fecp->fec_r_buff_size = PKT_MAXBLR_SIZE;
        fecp->fec_ecntrl = 2;
        fecp->fec_r_des_active = 0x01000000;

	/* Set the Ethernet address.  If using multiple Enets on the 8xx,
	 * this needs some work to get unique addresses.
	 *
	 * This is our default MAC address unless the user changes
	 * it via eth_mac_addr (our dev->set_mac_addr handler).
	 */
	fec_get_mac(dev, fep);

	/* Allocate memory for buffer descriptors.
	*/
	if (((RX_RING_SIZE + TX_RING_SIZE) * sizeof(cbd_t)) > PAGE_SIZE) {
		printk("FEC init error.  Need more space.\n");
		printk("FEC initialization failed.\n");
		return 1;
	}
	mem_addr = __get_free_page(GFP_KERNEL);
	cbd_base = (cbd_t *)mem_addr;
	/* XXX: missing check for allocation failure */

	fec_uncache(mem_addr);

	/* Set receive and transmit descriptor base.
	*/
	fep->rx_bd_base = cbd_base;
	fep->tx_bd_base = cbd_base + RX_RING_SIZE;

	fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
	fep->cur_rx = fep->rx_bd_base;

	fep->skb_cur = fep->skb_dirty = 0;

	/* Initialize the receive buffer descriptors.
	*/
	bdp = fep->rx_bd_base;
	for (i=0; i<FEC_ENET_RX_PAGES; i++) {

		/* Allocate a page.
		*/
		mem_addr = __get_free_page(GFP_KERNEL);
		/* XXX: missing check for allocation failure */

		fec_uncache(mem_addr);

		/* Initialize the BD for every fragment in the page.
		*/
		for (j=0; j<FEC_ENET_RX_FRPPG; j++) {
			bdp->cbd_sc = BD_ENET_RX_EMPTY;
			bdp->cbd_bufaddr = __pa(mem_addr);
			mem_addr += FEC_ENET_RX_FRSIZE;
			bdp++;
		}
	}

	/* Set the last buffer to wrap.
	*/
	bdp--;
	bdp->cbd_sc |= BD_SC_WRAP;

	/* ...and the same for transmmit.
	*/
	bdp = fep->tx_bd_base;
	for (i=0; i<TX_RING_SIZE; i++) {

		/* Initialize the BD for every fragment in the page.
		*/
		bdp->cbd_sc = 0;
		bdp->cbd_bufaddr = 0;
		bdp++;
	}

	/* Set the last buffer to wrap.
	*/
	bdp--;
	bdp->cbd_sc |= BD_SC_WRAP;

	/* Set receive and transmit descriptor base.
	*/
	fecp->fec_r_des_start = __pa((uint)(fep->rx_bd_base));
	fecp->fec_x_des_start = __pa((uint)(fep->tx_bd_base));

	/* Install our interrupt handlers. This varies depending on
	 * the architecture.
	*/
	fec_request_intrs(dev, fecp);

	dev->base_addr = (unsigned long)fecp;

	/* The FEC Ethernet specific entries in the device structure. */
	dev->open = fec_enet_open;
	dev->hard_start_xmit = fec_enet_start_xmit;
	dev->tx_timeout = fec_timeout;
	dev->watchdog_timeo = TX_TIMEOUT;
	dev->stop = fec_enet_close;
	dev->get_stats = fec_enet_get_stats;
	dev->set_multicast_list = set_multicast_list;

	for (i=0; i<NMII-1; i++)
		mii_cmds[i].mii_next = &mii_cmds[i+1];
	mii_free = mii_cmds;

	/* setup MII interface */
	fec_set_mii(dev, fep);

	printk("%s: FEC ENET Version 0.2, ", dev->name);
	for (i=0; i<5; i++)
		printk("%02x:", dev->dev_addr[i]);
	printk("%02x\n", dev->dev_addr[5]);

	/* Queue up command to detect the PHY and initialize the
	 * remainder of the interface.
	 */
	fep->phy_id_done = 0;
	fep->phy_addr = 0;
	mii_queue(dev, mk_mii_read(MII_REG_PHYIR1), mii_discover_phy);

	found++;
	return 0;
}

/* This function is called to start or restart the FEC during a link
 * change.  This only happens when switching between half and full
 * duplex.
 */
static void
fec_restart(struct net_device *dev, int duplex)
{
	struct fec_enet_private *fep;
	int i;
	unsigned char *eap;
	volatile cbd_t *bdp;
	volatile fec_t *fecp;

	fecp = fec_hwp;

	fep = netdev_priv(dev);

	/* Whack a reset.  We should wait for this.
	*/
	fecp->fec_ecntrl = 1;
	udelay(10);

	/* Enable interrupts we wish to service.
	*/
	fecp->fec_imask = (FEC_ENET_TXF | FEC_ENET_TXB |
				FEC_ENET_RXF | FEC_ENET_RXB | FEC_ENET_MII);

	/* Clear any outstanding interrupt.
	*/
	fecp->fec_ievent = 0xffc0;
	fec_enable_phy_intr();

	/* Set station address.
	*/
	fecp->fec_addr_low = (my_enet_addr[0] << 16) | my_enet_addr[1];
	fecp->fec_addr_high = (my_enet_addr[2] << 16);

	eap = (unsigned char *)&my_enet_addr[0];
	for (i=0; i<6; i++)
		dev->dev_addr[i] = *eap++;

	/* Reset all multicast.
	*/
	fecp->fec_hash_table_high = 0;
	fecp->fec_hash_table_low = 0;

	/* Set maximum receive buffer size.
	*/
	fecp->fec_r_buff_size = PKT_MAXBLR_SIZE;

	fec_localhw_setup();

	/* Set receive and transmit descriptor base.
	*/
	fecp->fec_r_des_start = __pa((uint)(fep->rx_bd_base));
	fecp->fec_x_des_start = __pa((uint)(fep->tx_bd_base));

	fep->dirty_tx = fep->cur_tx = fep->tx_bd_base;
	fep->cur_rx = fep->rx_bd_base;

	/* Reset SKB transmit buffers.
	*/
	fep->skb_cur = fep->skb_dirty = 0;
	for (i=0; i<=TX_RING_MOD_MASK; i++) {
		if (fep->tx_skbuff[i] != NULL) {
			dev_kfree_skb_any(fep->tx_skbuff[i]);
			fep->tx_skbuff[i] = NULL;
		}
	}

	/* Initialize the receive buffer descriptors.
	*/
	bdp = fep->rx_bd_base;
	for (i=0; i<RX_RING_SIZE; i++) {

		/* Initialize the BD for every fragment in the page.
		*/
		bdp->cbd_sc = BD_ENET_RX_EMPTY;
		bdp++;
	}

	/* Set the last buffer to wrap.
	*/
	bdp--;
	bdp->cbd_sc |= BD_SC_WRAP;

	/* ...and the same for transmmit.
	*/
	bdp = fep->tx_bd_base;
	for (i=0; i<TX_RING_SIZE; i++) {

		/* Initialize the BD for every fragment in the page.
		*/
		bdp->cbd_sc = 0;
		bdp->cbd_bufaddr = 0;
		bdp++;
	}

	/* Set the last buffer to wrap.
	*/
	bdp--;
	bdp->cbd_sc |= BD_SC_WRAP;

	/* Enable MII mode.
	*/
	if (duplex) {
		fecp->fec_r_cntrl = 0x04;	/* MII enable */
		fecp->fec_x_cntrl = 0x04;	/* FD enable */
	}
	else {
		fecp->fec_r_cntrl = 0x06;	/* MII enable|No Rcv on Xmit */
		fecp->fec_x_cntrl = 0x00;
	}
	fep->full_duplex = duplex;

	/* Set MII speed.
	*/
	fecp->fec_mii_speed = fep->phy_speed;

	/* And last, enable the transmit and receive processing.
	*/
	fecp->fec_ecntrl = 2;
	fecp->fec_r_des_active = 0x01000000;
}

static void
fec_stop(struct net_device *dev)
{
	volatile fec_t *fecp;
	struct fec_enet_private *fep;

	fecp = fec_hwp;
	fep = netdev_priv(dev);

	fecp->fec_x_cntrl = 0x01;	/* Graceful transmit stop */

	while(!(fecp->fec_ievent & 0x10000000));

	/* Whack a reset.  We should wait for this.
	*/
	fecp->fec_ecntrl = 1;
	udelay(10);

	/* Clear outstanding MII command interrupts.
	*/
	fecp->fec_ievent = FEC_ENET_MII;
	fec_enable_phy_intr();

	fecp->fec_imask = FEC_ENET_MII;
	fecp->fec_mii_speed = fep->phy_speed;
}

static struct net_device *fec_dev;

static int __init fec_enet_module_init(void)
{
	struct net_device *dev;
	int err;

	dev = alloc_etherdev(sizeof(struct fec_enet_private));
	if (!dev)
		return -ENOMEM;
	err = fec_enet_init(dev);
	if (err) {
		free_netdev(dev);
		return err;
	}

	if (register_netdev(dev) != 0) {
		/* XXX: missing cleanup here */
		free_netdev(dev);
		return -EIO;
	}
	fec_dev = dev;
	return(0);
}

module_init(fec_enet_module_init);

MODULE_LICENSE("GPL");