eth_v10.c

来自「linux 内核源代码」· C语言 代码 · 共 1,954 行 · 第 1/4 页

	if (cris_request_io_interface(if_eth, cardname)) {
		printk(KERN_CRIT "etrax_ethernet_init failed to get IO interface\n");
		return -EBUSY;
	}

	dev = alloc_etherdev(sizeof(struct net_local));
	if (!dev)
		return -ENOMEM;

	np = netdev_priv(dev);

	/* we do our own locking */
	dev->features |= NETIF_F_LLTX;

	dev->base_addr = (unsigned int)R_NETWORK_SA_0; /* just to have something to show */

	/* now setup our etrax specific stuff */

	dev->irq = NETWORK_DMA_RX_IRQ_NBR; /* we really use DMATX as well... */
	dev->dma = NETWORK_RX_DMA_NBR;

	/* fill in our handlers so the network layer can talk to us in the future */

	dev->open               = e100_open;
	dev->hard_start_xmit    = e100_send_packet;
	dev->stop               = e100_close;
	dev->get_stats          = e100_get_stats;
	dev->set_multicast_list = set_multicast_list;
	dev->set_mac_address    = e100_set_mac_address;
	dev->ethtool_ops	= &e100_ethtool_ops;
	dev->do_ioctl           = e100_ioctl;
	dev->set_config		= e100_set_config;
	dev->tx_timeout         = e100_tx_timeout;
#ifdef CONFIG_NET_POLL_CONTROLLER
	dev->poll_controller = e100_netpoll;
#endif

	spin_lock_init(&np->lock);
	spin_lock_init(&np->led_lock);
	spin_lock_init(&np->transceiver_lock);

	/* Initialise the list of Etrax DMA-descriptors */

	/* Initialise receive descriptors */

	for (i = 0; i < NBR_OF_RX_DESC; i++) {
		/* Allocate two extra cachelines to make sure that buffer used
		 * by DMA does not share cacheline with any other data (to
		 * avoid cache bug)
		 */
		RxDescList[i].skb = dev_alloc_skb(MAX_MEDIA_DATA_SIZE + 2 * L1_CACHE_BYTES);
		if (!RxDescList[i].skb)
			return -ENOMEM;
		RxDescList[i].descr.ctrl   = 0;
		RxDescList[i].descr.sw_len = MAX_MEDIA_DATA_SIZE;
		RxDescList[i].descr.next   = virt_to_phys(&RxDescList[i + 1]);
		RxDescList[i].descr.buf    = L1_CACHE_ALIGN(virt_to_phys(RxDescList[i].skb->data));
		RxDescList[i].descr.status = 0;
		RxDescList[i].descr.hw_len = 0;
		prepare_rx_descriptor(&RxDescList[i].descr);
	}

	RxDescList[NBR_OF_RX_DESC - 1].descr.ctrl   = d_eol;
	RxDescList[NBR_OF_RX_DESC - 1].descr.next   = virt_to_phys(&RxDescList[0]);
	rx_queue_len = 0;

	/* Initialize transmit descriptors */
	for (i = 0; i < NBR_OF_TX_DESC; i++) {
		TxDescList[i].descr.ctrl   = 0;
		TxDescList[i].descr.sw_len = 0;
		TxDescList[i].descr.next   = virt_to_phys(&TxDescList[i + 1].descr);
		TxDescList[i].descr.buf    = 0;
		TxDescList[i].descr.status = 0;
		TxDescList[i].descr.hw_len = 0;
		TxDescList[i].skb = 0;
	}

	TxDescList[NBR_OF_TX_DESC - 1].descr.ctrl   = d_eol;
	TxDescList[NBR_OF_TX_DESC - 1].descr.next   = virt_to_phys(&TxDescList[0].descr);

	/* Initialise initial pointers */

	myNextRxDesc  = &RxDescList[0];
	myLastRxDesc  = &RxDescList[NBR_OF_RX_DESC - 1];
	myFirstTxDesc = &TxDescList[0];
	myNextTxDesc  = &TxDescList[0];
	myLastTxDesc  = &TxDescList[NBR_OF_TX_DESC - 1];

	/* Register device */
	err = register_netdev(dev);
	if (err) {
		free_netdev(dev);
		return err;
	}

	/* set the default MAC address */

	e100_set_mac_address(dev, &default_mac);

	/* Initialize speed indicator stuff. */

	current_speed = 10;
	current_speed_selection = 0; /* Auto */
	speed_timer.expires = jiffies + NET_LINK_UP_CHECK_INTERVAL;
	speed_timer.data = (unsigned long)dev;
	speed_timer.function = e100_check_speed;

	clear_led_timer.function = e100_clear_network_leds;
	clear_led_timer.data = (unsigned long)dev;

	full_duplex = 0;
	current_duplex = autoneg;
	duplex_timer.expires = jiffies + NET_DUPLEX_CHECK_INTERVAL;
        duplex_timer.data = (unsigned long)dev;
	duplex_timer.function = e100_check_duplex;

        /* Initialize mii interface */
	np->mii_if.phy_id_mask = 0x1f;
	np->mii_if.reg_num_mask = 0x1f;
	np->mii_if.dev = dev;
	np->mii_if.mdio_read = e100_get_mdio_reg;
	np->mii_if.mdio_write = e100_set_mdio_reg;

	/* Initialize group address registers to make sure that no */
	/* unwanted addresses are matched */
	*R_NETWORK_GA_0 = 0x00000000;
	*R_NETWORK_GA_1 = 0x00000000;

	/* Initialize next time the led can flash */
	led_next_time = jiffies;
	return 0;
}

/* set MAC address of the interface. called from the core after a
 * SIOCSIFADDR ioctl, and from the bootup above.
 */

static int
e100_set_mac_address(struct net_device *dev, void *p)
{
	struct net_local *np = netdev_priv(dev);
	struct sockaddr *addr = p;
	DECLARE_MAC_BUF(mac);

	spin_lock(&np->lock); /* preemption protection */

	/* remember it */

	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

	/* Write it to the hardware.
	 * Note the way the address is wrapped:
	 * *R_NETWORK_SA_0 = a0_0 | (a0_1 << 8) | (a0_2 << 16) | (a0_3 << 24);
	 * *R_NETWORK_SA_1 = a0_4 | (a0_5 << 8);
	 */

	*R_NETWORK_SA_0 = dev->dev_addr[0] | (dev->dev_addr[1] << 8) |
		(dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
	*R_NETWORK_SA_1 = dev->dev_addr[4] | (dev->dev_addr[5] << 8);
	*R_NETWORK_SA_2 = 0;

	/* show it in the log as well */

	printk(KERN_INFO "%s: changed MAC to %s\n",
	       dev->name, print_mac(mac, dev->dev_addr));

	spin_unlock(&np->lock);

	return 0;
}

/*
 * Open/initialize the board. This is called (in the current kernel)
 * sometime after booting when the 'ifconfig' program is run.
 *
 * This routine should set everything up anew at each open, even
 * registers that "should" only need to be set once at boot, so that
 * there is non-reboot way to recover if something goes wrong.
 */

static int
e100_open(struct net_device *dev)
{
	unsigned long flags;

	/* enable the MDIO output pin */

	*R_NETWORK_MGM_CTRL = IO_STATE(R_NETWORK_MGM_CTRL, mdoe, enable);

	*R_IRQ_MASK0_CLR =
		IO_STATE(R_IRQ_MASK0_CLR, overrun, clr) |
		IO_STATE(R_IRQ_MASK0_CLR, underrun, clr) |
		IO_STATE(R_IRQ_MASK0_CLR, excessive_col, clr);

	/* clear dma0 and 1 eop and descr irq masks */
	*R_IRQ_MASK2_CLR =
		IO_STATE(R_IRQ_MASK2_CLR, dma0_descr, clr) |
		IO_STATE(R_IRQ_MASK2_CLR, dma0_eop, clr) |
		IO_STATE(R_IRQ_MASK2_CLR, dma1_descr, clr) |
		IO_STATE(R_IRQ_MASK2_CLR, dma1_eop, clr);

	/* Reset and wait for the DMA channels */

	RESET_DMA(NETWORK_TX_DMA_NBR);
	RESET_DMA(NETWORK_RX_DMA_NBR);
	WAIT_DMA(NETWORK_TX_DMA_NBR);
	WAIT_DMA(NETWORK_RX_DMA_NBR);

	/* Initialise the etrax network controller */

	/* allocate the irq corresponding to the receiving DMA */

	if (request_irq(NETWORK_DMA_RX_IRQ_NBR, e100rxtx_interrupt,
			IRQF_SAMPLE_RANDOM, cardname, (void *)dev)) {
		goto grace_exit0;
	}

	/* allocate the irq corresponding to the transmitting DMA */

	if (request_irq(NETWORK_DMA_TX_IRQ_NBR, e100rxtx_interrupt, 0,
			cardname, (void *)dev)) {
		goto grace_exit1;
	}

	/* allocate the irq corresponding to the network errors etc */

	if (request_irq(NETWORK_STATUS_IRQ_NBR, e100nw_interrupt, 0,
			cardname, (void *)dev)) {
		goto grace_exit2;
	}

	/*
	 * Always allocate the DMA channels after the IRQ,
	 * and clean up on failure.
	 */

	if (cris_request_dma(NETWORK_TX_DMA_NBR,
	                     cardname,
	                     DMA_VERBOSE_ON_ERROR,
	                     dma_eth)) {
		goto grace_exit3;
        }

	if (cris_request_dma(NETWORK_RX_DMA_NBR,
	                     cardname,
	                     DMA_VERBOSE_ON_ERROR,
	                     dma_eth)) {
		goto grace_exit4;
        }

	/* give the HW an idea of what MAC address we want */

	*R_NETWORK_SA_0 = dev->dev_addr[0] | (dev->dev_addr[1] << 8) |
		(dev->dev_addr[2] << 16) | (dev->dev_addr[3] << 24);
	*R_NETWORK_SA_1 = dev->dev_addr[4] | (dev->dev_addr[5] << 8);
	*R_NETWORK_SA_2 = 0;

#if 0
	/* use promiscuous mode for testing */
	*R_NETWORK_GA_0 = 0xffffffff;
	*R_NETWORK_GA_1 = 0xffffffff;

	*R_NETWORK_REC_CONFIG = 0xd; /* broadcast rec, individ. rec, ma0 enabled */
#else
	SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, max_size, size1522);
	SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, broadcast, receive);
	SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, ma0, enable);
	SETF(network_rec_config_shadow, R_NETWORK_REC_CONFIG, duplex, full_duplex);
	*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
#endif

	*R_NETWORK_GEN_CONFIG =
		IO_STATE(R_NETWORK_GEN_CONFIG, phy,    mii_clk) |
		IO_STATE(R_NETWORK_GEN_CONFIG, enable, on);

	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, clr_error, clr);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, delay, none);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, cancel, dont);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, cd, enable);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, retry, enable);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, pad, enable);
	SETS(network_tr_ctrl_shadow, R_NETWORK_TR_CTRL, crc, enable);
	*R_NETWORK_TR_CTRL = network_tr_ctrl_shadow;

	local_irq_save(flags);

	/* enable the irq's for ethernet DMA */

	*R_IRQ_MASK2_SET =
		IO_STATE(R_IRQ_MASK2_SET, dma0_eop, set) |
		IO_STATE(R_IRQ_MASK2_SET, dma1_eop, set);

	*R_IRQ_MASK0_SET =
		IO_STATE(R_IRQ_MASK0_SET, overrun,       set) |
		IO_STATE(R_IRQ_MASK0_SET, underrun,      set) |
		IO_STATE(R_IRQ_MASK0_SET, excessive_col, set);

	/* make sure the irqs are cleared */

	*R_DMA_CH0_CLR_INTR = IO_STATE(R_DMA_CH0_CLR_INTR, clr_eop, do);
	*R_DMA_CH1_CLR_INTR = IO_STATE(R_DMA_CH1_CLR_INTR, clr_eop, do);

	/* make sure the rec and transmit error counters are cleared */

	(void)*R_REC_COUNTERS;  /* dummy read */
	(void)*R_TR_COUNTERS;   /* dummy read */

	/* start the receiving DMA channel so we can receive packets from now on */

	*R_DMA_CH1_FIRST = virt_to_phys(myNextRxDesc);
	*R_DMA_CH1_CMD = IO_STATE(R_DMA_CH1_CMD, cmd, start);

	/* Set up transmit DMA channel so it can be restarted later */

	*R_DMA_CH0_FIRST = 0;
	*R_DMA_CH0_DESCR = virt_to_phys(myLastTxDesc);
	netif_start_queue(dev);

	local_irq_restore(flags);

	/* Probe for transceiver */
	if (e100_probe_transceiver(dev))
		goto grace_exit5;

	/* Start duplex/speed timers */
	add_timer(&speed_timer);
	add_timer(&duplex_timer);

	/* We are now ready to accept transmit requeusts from
	 * the queueing layer of the networking.
	 */
	netif_carrier_on(dev);

	return 0;

grace_exit5:
	cris_free_dma(NETWORK_RX_DMA_NBR, cardname);
grace_exit4:
	cris_free_dma(NETWORK_TX_DMA_NBR, cardname);
grace_exit3:
	free_irq(NETWORK_STATUS_IRQ_NBR, (void *)dev);
grace_exit2:
	free_irq(NETWORK_DMA_TX_IRQ_NBR, (void *)dev);
grace_exit1:
	free_irq(NETWORK_DMA_RX_IRQ_NBR, (void *)dev);
grace_exit0:
	return -EAGAIN;
}

#if defined(CONFIG_ETRAX_NO_PHY)
static void
dummy_check_speed(struct net_device* dev)
{
	current_speed = 100;
}
#else
static void
generic_check_speed(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE);
	if ((data & ADVERTISE_100FULL) ||
	    (data & ADVERTISE_100HALF))
		current_speed = 100;
	else
		current_speed = 10;
}

static void
tdk_check_speed(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
				 MDIO_TDK_DIAGNOSTIC_REG);
	current_speed = (data & MDIO_TDK_DIAGNOSTIC_RATE ? 100 : 10);
}

static void
broadcom_check_speed(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
				 MDIO_AUX_CTRL_STATUS_REG);
	current_speed = (data & MDIO_BC_SPEED ? 100 : 10);
}

static void
intel_check_speed(struct net_device* dev)
{
	unsigned long data;
	struct net_local *np = netdev_priv(dev);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
				 MDIO_INT_STATUS_REG_2);
	current_speed = (data & MDIO_INT_SPEED ? 100 : 10);
}
#endif
static void
e100_check_speed(unsigned long priv)
{
	struct net_device* dev = (struct net_device*)priv;
	struct net_local *np = netdev_priv(dev);
	static int led_initiated = 0;
	unsigned long data;
	int old_speed = current_speed;

	spin_lock(&np->transceiver_lock);

	data = e100_get_mdio_reg(dev, np->mii_if.phy_id, MII_BMSR);
	if (!(data & BMSR_LSTATUS)) {
		current_speed = 0;
	} else {
		transceiver->check_speed(dev);
	}

	spin_lock(&np->led_lock);
	if ((old_speed != current_speed) || !led_initiated) {
		led_initiated = 1;
		e100_set_network_leds(NO_NETWORK_ACTIVITY);
		if (current_speed)
			netif_carrier_on(dev);
		else
			netif_carrier_off(dev);
	}
	spin_unlock(&np->led_lock);

	/* Reinitialize the timer. */
	speed_timer.expires = jiffies + NET_LINK_UP_CHECK_INTERVAL;
	add_timer(&speed_timer);

	spin_unlock(&np->transceiver_lock);
}

static void
e100_negotiate(struct net_device* dev)
{
	struct net_local *np = netdev_priv(dev);
	unsigned short data = e100_get_mdio_reg(dev, np->mii_if.phy_id,
						MII_ADVERTISE);

	/* Discard old speed and duplex settings */
	data &= ~(ADVERTISE_100HALF | ADVERTISE_100FULL |
	          ADVERTISE_10HALF | ADVERTISE_10FULL);

	switch (current_speed_selection) {
		case 10:
			if (current_duplex == full)
				data |= ADVERTISE_10FULL;
			else if (current_duplex == half)
				data |= ADVERTISE_10HALF;
			else
				data |= ADVERTISE_10HALF | ADVERTISE_10FULL;
			break;

		case 100:
			 if (current_duplex == full)
				data |= ADVERTISE_100FULL;
			else if (current_duplex == half)
				data |= ADVERTISE_100HALF;
			else
				data |= ADVERTISE_100HALF | ADVERTISE_100FULL;
			break;

		case 0: /* Auto */
			 if (current_duplex == full)
				data |= ADVERTISE_100FULL | ADVERTISE_10FULL;
			else if (current_duplex == half)
				data |= ADVERTISE_100HALF | ADVERTISE_10HALF;
			else
				data |= ADVERTISE_10HALF | ADVERTISE_10FULL |
				  ADVERTISE_100HALF | ADVERTISE_100FULL;
			break;

		default: /* assume autoneg speed and duplex */
			data |= ADVERTISE_10HALF | ADVERTISE_10FULL |
				  ADVERTISE_100HALF | ADVERTISE_100FULL;
			break;
	}

	e100_set_mdio_reg(dev, np->mii_if.phy_id, MII_ADVERTISE, data);

	/* Renegotiate with link partner */