eth_v10.c

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

		}

		skb_put(skb, length - ETHER_HEAD_LEN);        /* allocate room for the packet body */
		skb_data_ptr = skb_push(skb, ETHER_HEAD_LEN); /* allocate room for the header */

#ifdef ETHDEBUG
		printk("head = 0x%x, data = 0x%x, tail = 0x%x, end = 0x%x\n",
		       skb->head, skb->data, skb_tail_pointer(skb),
		       skb_end_pointer(skb));
		printk("copying packet to 0x%x.\n", skb_data_ptr);
#endif

		memcpy(skb_data_ptr, phys_to_virt(myNextRxDesc->descr.buf), length);
	}
	else {
		/* Large packet, send directly to upper layers and allocate new
		 * memory (aligned to cache line boundary to avoid bug).
		 * Before sending the skb to upper layers we must make sure
		 * that skb->data points to the aligned start of the packet.
		 */
		int align;
		struct sk_buff *new_skb = dev_alloc_skb(MAX_MEDIA_DATA_SIZE + 2 * L1_CACHE_BYTES);
		if (!new_skb) {
			np->stats.rx_errors++;
			printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
			goto update_nextrxdesc;
		}
		skb = myNextRxDesc->skb;
		align = (int)phys_to_virt(myNextRxDesc->descr.buf) - (int)skb->data;
		skb_put(skb, length + align);
		skb_pull(skb, align); /* Remove alignment bytes */
		myNextRxDesc->skb = new_skb;
		myNextRxDesc->descr.buf = L1_CACHE_ALIGN(virt_to_phys(myNextRxDesc->skb->data));
	}

	skb->protocol = eth_type_trans(skb, dev);

	/* Send the packet to the upper layers */
	netif_rx(skb);

  update_nextrxdesc:
	/* Prepare for next packet */
	myNextRxDesc->descr.status = 0;
	prevRxDesc = myNextRxDesc;
	myNextRxDesc = phys_to_virt(myNextRxDesc->descr.next);

	rx_queue_len++;

	/* Check if descriptors should be returned */
	if (rx_queue_len == RX_QUEUE_THRESHOLD) {
		flush_etrax_cache();
		prevRxDesc->descr.ctrl |= d_eol;
		myLastRxDesc->descr.ctrl &= ~d_eol;
		myLastRxDesc = prevRxDesc;
		rx_queue_len = 0;
	}
}

/* The inverse routine to net_open(). */
static int
e100_close(struct net_device *dev)
{
	struct net_local *np = netdev_priv(dev);

	printk(KERN_INFO "Closing %s.\n", dev->name);

	netif_stop_queue(dev);

	*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);

	*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);

	/* Stop the receiver and the transmitter */

	RESET_DMA(NETWORK_TX_DMA_NBR);
	RESET_DMA(NETWORK_RX_DMA_NBR);

	/* Flush the Tx and disable Rx here. */

	free_irq(NETWORK_DMA_RX_IRQ_NBR, (void *)dev);
	free_irq(NETWORK_DMA_TX_IRQ_NBR, (void *)dev);
	free_irq(NETWORK_STATUS_IRQ_NBR, (void *)dev);

	cris_free_dma(NETWORK_TX_DMA_NBR, cardname);
	cris_free_dma(NETWORK_RX_DMA_NBR, cardname);

	/* Update the statistics here. */

	update_rx_stats(&np->stats);
	update_tx_stats(&np->stats);

	/* Stop speed/duplex timers */
	del_timer(&speed_timer);
	del_timer(&duplex_timer);

	return 0;
}

static int
e100_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct mii_ioctl_data *data = if_mii(ifr);
	struct net_local *np = netdev_priv(dev);
	int rc = 0;
        int old_autoneg;

	spin_lock(&np->lock); /* Preempt protection */
	switch (cmd) {
		/* The ioctls below should be considered obsolete but are */
		/* still present for compatability with old scripts/apps  */
		case SET_ETH_SPEED_10:                  /* 10 Mbps */
			e100_set_speed(dev, 10);
			break;
		case SET_ETH_SPEED_100:                /* 100 Mbps */
			e100_set_speed(dev, 100);
			break;
		case SET_ETH_SPEED_AUTO:        /* Auto-negotiate speed */
			e100_set_speed(dev, 0);
			break;
		case SET_ETH_DUPLEX_HALF:       /* Half duplex */
			e100_set_duplex(dev, half);
			break;
		case SET_ETH_DUPLEX_FULL:       /* Full duplex */
			e100_set_duplex(dev, full);
			break;
		case SET_ETH_DUPLEX_AUTO:       /* Auto-negotiate duplex */
			e100_set_duplex(dev, autoneg);
			break;
	        case SET_ETH_AUTONEG:
			old_autoneg = autoneg_normal;
		        autoneg_normal = *(int*)data;
			if (autoneg_normal != old_autoneg)
				e100_negotiate(dev);
			break;
		default:
			rc = generic_mii_ioctl(&np->mii_if, if_mii(ifr),
						cmd, NULL);
			break;
	}
	spin_unlock(&np->lock);
	return rc;
}

static int e100_get_settings(struct net_device *dev,
			     struct ethtool_cmd *cmd)
{
	struct net_local *np = netdev_priv(dev);
	int err;

	spin_lock_irq(&np->lock);
	err = mii_ethtool_gset(&np->mii_if, cmd);
	spin_unlock_irq(&np->lock);

	/* The PHY may support 1000baseT, but the Etrax100 does not.  */
	cmd->supported &= ~(SUPPORTED_1000baseT_Half
			    | SUPPORTED_1000baseT_Full);
	return err;
}

static int e100_set_settings(struct net_device *dev,
			     struct ethtool_cmd *ecmd)
{
	if (ecmd->autoneg == AUTONEG_ENABLE) {
		e100_set_duplex(dev, autoneg);
		e100_set_speed(dev, 0);
	} else {
		e100_set_duplex(dev, ecmd->duplex == DUPLEX_HALF ? half : full);
		e100_set_speed(dev, ecmd->speed == SPEED_10 ? 10: 100);
	}

	return 0;
}

static void e100_get_drvinfo(struct net_device *dev,
			     struct ethtool_drvinfo *info)
{
	strncpy(info->driver, "ETRAX 100LX", sizeof(info->driver) - 1);
	strncpy(info->version, "$Revision: 1.31 $", sizeof(info->version) - 1);
	strncpy(info->fw_version, "N/A", sizeof(info->fw_version) - 1);
	strncpy(info->bus_info, "N/A", sizeof(info->bus_info) - 1);
}

static int e100_nway_reset(struct net_device *dev)
{
	if (current_duplex == autoneg && current_speed_selection == 0)
		e100_negotiate(dev);
	return 0;
}

static const struct ethtool_ops e100_ethtool_ops = {
	.get_settings	= e100_get_settings,
	.set_settings	= e100_set_settings,
	.get_drvinfo	= e100_get_drvinfo,
	.nway_reset	= e100_nway_reset,
	.get_link	= ethtool_op_get_link,
};

static int
e100_set_config(struct net_device *dev, struct ifmap *map)
{
	struct net_local *np = netdev_priv(dev);

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

	switch(map->port) {
		case IF_PORT_UNKNOWN:
			/* Use autoneg */
			e100_set_speed(dev, 0);
			e100_set_duplex(dev, autoneg);
			break;
		case IF_PORT_10BASET:
			e100_set_speed(dev, 10);
			e100_set_duplex(dev, autoneg);
			break;
		case IF_PORT_100BASET:
		case IF_PORT_100BASETX:
			e100_set_speed(dev, 100);
			e100_set_duplex(dev, autoneg);
			break;
		case IF_PORT_100BASEFX:
		case IF_PORT_10BASE2:
		case IF_PORT_AUI:
			spin_unlock(&np->lock);
			return -EOPNOTSUPP;
			break;
		default:
			printk(KERN_ERR "%s: Invalid media selected", dev->name);
			spin_unlock(&np->lock);
			return -EINVAL;
	}
	spin_unlock(&np->lock);
	return 0;
}

static void
update_rx_stats(struct net_device_stats *es)
{
	unsigned long r = *R_REC_COUNTERS;
	/* update stats relevant to reception errors */
	es->rx_fifo_errors += IO_EXTRACT(R_REC_COUNTERS, congestion, r);
	es->rx_crc_errors += IO_EXTRACT(R_REC_COUNTERS, crc_error, r);
	es->rx_frame_errors += IO_EXTRACT(R_REC_COUNTERS, alignment_error, r);
	es->rx_length_errors += IO_EXTRACT(R_REC_COUNTERS, oversize, r);
}

static void
update_tx_stats(struct net_device_stats *es)
{
	unsigned long r = *R_TR_COUNTERS;
	/* update stats relevant to transmission errors */
	es->collisions +=
		IO_EXTRACT(R_TR_COUNTERS, single_col, r) +
		IO_EXTRACT(R_TR_COUNTERS, multiple_col, r);
}

/*
 * Get the current statistics.
 * This may be called with the card open or closed.
 */
static struct net_device_stats *
e100_get_stats(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	unsigned long flags;

	spin_lock_irqsave(&lp->lock, flags);

	update_rx_stats(&lp->stats);
	update_tx_stats(&lp->stats);

	spin_unlock_irqrestore(&lp->lock, flags);
	return &lp->stats;
}

/*
 * Set or clear the multicast filter for this adaptor.
 * num_addrs == -1	Promiscuous mode, receive all packets
 * num_addrs == 0	Normal mode, clear multicast list
 * num_addrs > 0	Multicast mode, receive normal and MC packets,
 *			and do best-effort filtering.
 */
static void
set_multicast_list(struct net_device *dev)
{
	struct net_local *lp = netdev_priv(dev);
	int num_addr = dev->mc_count;
	unsigned long int lo_bits;
	unsigned long int hi_bits;

	spin_lock(&lp->lock);
	if (dev->flags & IFF_PROMISC) {
		/* promiscuous mode */
		lo_bits = 0xfffffffful;
		hi_bits = 0xfffffffful;

		/* Enable individual receive */
		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, receive);
		*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
	} else if (dev->flags & IFF_ALLMULTI) {
		/* enable all multicasts */
		lo_bits = 0xfffffffful;
		hi_bits = 0xfffffffful;

		/* Disable individual receive */
		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
		*R_NETWORK_REC_CONFIG =  network_rec_config_shadow;
	} else if (num_addr == 0) {
		/* Normal, clear the mc list */
		lo_bits = 0x00000000ul;
		hi_bits = 0x00000000ul;

		/* Disable individual receive */
		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
		*R_NETWORK_REC_CONFIG =  network_rec_config_shadow;
	} else {
		/* MC mode, receive normal and MC packets */
		char hash_ix;
		struct dev_mc_list *dmi = dev->mc_list;
		int i;
		char *baddr;

		lo_bits = 0x00000000ul;
		hi_bits = 0x00000000ul;
		for (i = 0; i < num_addr; i++) {
			/* Calculate the hash index for the GA registers */

			hash_ix = 0;
			baddr = dmi->dmi_addr;
			hash_ix ^= (*baddr) & 0x3f;
			hash_ix ^= ((*baddr) >> 6) & 0x03;
			++baddr;
			hash_ix ^= ((*baddr) << 2) & 0x03c;
			hash_ix ^= ((*baddr) >> 4) & 0xf;
			++baddr;
			hash_ix ^= ((*baddr) << 4) & 0x30;
			hash_ix ^= ((*baddr) >> 2) & 0x3f;
			++baddr;
			hash_ix ^= (*baddr) & 0x3f;
			hash_ix ^= ((*baddr) >> 6) & 0x03;
			++baddr;
			hash_ix ^= ((*baddr) << 2) & 0x03c;
			hash_ix ^= ((*baddr) >> 4) & 0xf;
			++baddr;
			hash_ix ^= ((*baddr) << 4) & 0x30;
			hash_ix ^= ((*baddr) >> 2) & 0x3f;

			hash_ix &= 0x3f;

			if (hash_ix >= 32) {
				hi_bits |= (1 << (hash_ix-32));
			} else {
				lo_bits |= (1 << hash_ix);
			}
			dmi = dmi->next;
		}
		/* Disable individual receive */
		SETS(network_rec_config_shadow, R_NETWORK_REC_CONFIG, individual, discard);
		*R_NETWORK_REC_CONFIG = network_rec_config_shadow;
	}
	*R_NETWORK_GA_0 = lo_bits;
	*R_NETWORK_GA_1 = hi_bits;
	spin_unlock(&lp->lock);
}

void
e100_hardware_send_packet(struct net_local *np, char *buf, int length)
{
	D(printk("e100 send pack, buf 0x%x len %d\n", buf, length));

	spin_lock(&np->led_lock);
	if (!led_active && time_after(jiffies, led_next_time)) {
		/* light the network leds depending on the current speed. */
		e100_set_network_leds(NETWORK_ACTIVITY);

		/* Set the earliest time we may clear the LED */
		led_next_time = jiffies + NET_FLASH_TIME;
		led_active = 1;
		mod_timer(&clear_led_timer, jiffies + HZ/10);
	}
	spin_unlock(&np->led_lock);

	/* configure the tx dma descriptor */
	myNextTxDesc->descr.sw_len = length;
	myNextTxDesc->descr.ctrl = d_eop | d_eol | d_wait;
	myNextTxDesc->descr.buf = virt_to_phys(buf);

        /* Move end of list */
        myLastTxDesc->descr.ctrl &= ~d_eol;
        myLastTxDesc = myNextTxDesc;

	/* Restart DMA channel */
	*R_DMA_CH0_CMD = IO_STATE(R_DMA_CH0_CMD, cmd, restart);
}

static void
e100_clear_network_leds(unsigned long dummy)
{
	struct net_device *dev = (struct net_device *)dummy;
	struct net_local *np = netdev_priv(dev);

	spin_lock(&np->led_lock);

	if (led_active && time_after(jiffies, led_next_time)) {
		e100_set_network_leds(NO_NETWORK_ACTIVITY);

		/* Set the earliest time we may set the LED */
		led_next_time = jiffies + NET_FLASH_PAUSE;
		led_active = 0;
	}

	spin_unlock(&np->led_lock);
}

static void
e100_set_network_leds(int active)
{
#if defined(CONFIG_ETRAX_NETWORK_LED_ON_WHEN_LINK)
	int light_leds = (active == NO_NETWORK_ACTIVITY);
#elif defined(CONFIG_ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY)
	int light_leds = (active == NETWORK_ACTIVITY);
#else
#error "Define either CONFIG_ETRAX_NETWORK_LED_ON_WHEN_LINK or CONFIG_ETRAX_NETWORK_LED_ON_WHEN_ACTIVITY"
#endif

	if (!current_speed) {
		/* Make LED red, link is down */
#if defined(CONFIG_ETRAX_NETWORK_RED_ON_NO_CONNECTION)
		LED_NETWORK_SET(LED_RED);
#else
		LED_NETWORK_SET(LED_OFF);
#endif
	} else if (light_leds) {
		if (current_speed == 10) {
			LED_NETWORK_SET(LED_ORANGE);
		} else {
			LED_NETWORK_SET(LED_GREEN);
		}
	} else {
		LED_NETWORK_SET(LED_OFF);
	}
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void
e100_netpoll(struct net_device* netdev)
{
	e100rxtx_interrupt(NETWORK_DMA_TX_IRQ_NBR, netdev, NULL);
}
#endif

static int
etrax_init_module(void)
{
	return etrax_ethernet_init();
}

static int __init
e100_boot_setup(char* str)
{
	struct sockaddr sa = {0};
	int i;

	/* Parse the colon separated Ethernet station address */
	for (i = 0; i <  ETH_ALEN; i++) {
		unsigned int tmp;
		if (sscanf(str + 3*i, "%2x", &tmp) != 1) {
			printk(KERN_WARNING "Malformed station address");
			return 0;
		}
		sa.sa_data[i] = (char)tmp;
	}

	default_mac = sa;
	return 1;
}

__setup("etrax100_eth=", e100_boot_setup);

module_init(etrax_init_module);