C++ GRETH_REGSAVE函数代码示例

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本文整理汇总了C++中GRETH_REGSAVE函数的典型用法代码示例。如果您正苦于以下问题：C++ GRETH_REGSAVE函数的具体用法？C++ GRETH_REGSAVE怎么用？C++ GRETH_REGSAVE使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。

在下文中一共展示了GRETH_REGSAVE函数的12个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: greth_poll

static int greth_poll(struct napi_struct *napi, int budget)
{
	struct greth_private *greth;
	int work_done = 0;
	unsigned long flags;
	u32 mask, ctrl;
	greth = container_of(napi, struct greth_private, napi);

restart_txrx_poll:
	if (netif_queue_stopped(greth->netdev)) {
		if (greth->gbit_mac)
			greth_clean_tx_gbit(greth->netdev);
		else
			greth_clean_tx(greth->netdev);
	}

	if (greth->gbit_mac) {
		work_done += greth_rx_gbit(greth->netdev, budget - work_done);
	} else {
		work_done += greth_rx(greth->netdev, budget - work_done);
	}

	if (work_done < budget) {

		spin_lock_irqsave(&greth->devlock, flags);

		ctrl = GRETH_REGLOAD(greth->regs->control);
		if (netif_queue_stopped(greth->netdev)) {
			GRETH_REGSAVE(greth->regs->control,
					ctrl | GRETH_TXI | GRETH_RXI);
			mask = GRETH_INT_RX | GRETH_INT_RE |
			       GRETH_INT_TX | GRETH_INT_TE;
		} else {
			GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_RXI);
			mask = GRETH_INT_RX | GRETH_INT_RE;
		}

		if (GRETH_REGLOAD(greth->regs->status) & mask) {
			GRETH_REGSAVE(greth->regs->control, ctrl);
			spin_unlock_irqrestore(&greth->devlock, flags);
			goto restart_txrx_poll;
		} else {
			__napi_complete(napi);
			spin_unlock_irqrestore(&greth->devlock, flags);
		}
	}

	return work_done;
}

开发者ID:CSCLOG，项目名称:beaglebone，代码行数:49，代码来源:greth.c

示例2: greth_start_xmit

static netdev_tx_t
greth_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
	struct greth_private *greth = netdev_priv(dev);
	struct greth_bd *bdp;
	int err = NETDEV_TX_OK;
	u32 status, dma_addr, ctrl;
	unsigned long flags;

	/* Clean TX Ring */
	greth_clean_tx(greth->netdev);

	if (unlikely(greth->tx_free <= 0)) {
		spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
		ctrl = GRETH_REGLOAD(greth->regs->control);
		/* Enable TX IRQ only if not already in poll() routine */
		if (ctrl & GRETH_RXI)
			GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
		netif_stop_queue(dev);
		spin_unlock_irqrestore(&greth->devlock, flags);
		return NETDEV_TX_BUSY;
	}

	if (netif_msg_pktdata(greth))
		greth_print_tx_packet(skb);


	if (unlikely(skb->len > MAX_FRAME_SIZE)) {
		dev->stats.tx_errors++;
		goto out;
	}

	bdp = greth->tx_bd_base + greth->tx_next;
	dma_addr = greth_read_bd(&bdp->addr);

	memcpy((unsigned char *) phys_to_virt(dma_addr), skb->data, skb->len);

	dma_sync_single_for_device(greth->dev, dma_addr, skb->len, DMA_TO_DEVICE);

	status = GRETH_BD_EN | GRETH_BD_IE | (skb->len & GRETH_BD_LEN);
	greth->tx_bufs_length[greth->tx_next] = skb->len & GRETH_BD_LEN;

	/* Wrap around descriptor ring */
	if (greth->tx_next == GRETH_TXBD_NUM_MASK) {
		status |= GRETH_BD_WR;
	}

	greth->tx_next = NEXT_TX(greth->tx_next);
	greth->tx_free--;

	/* Write descriptor control word and enable transmission */
	greth_write_bd(&bdp->stat, status);
	spin_lock_irqsave(&greth->devlock, flags); /*save from poll/irq*/
	greth_enable_tx(greth);
	spin_unlock_irqrestore(&greth->devlock, flags);

out:
	dev_kfree_skb(skb);
	return err;
}

开发者ID:513855417，项目名称:linux，代码行数:60，代码来源:greth.c

示例3: greth_open

static int greth_open(struct net_device *dev)
{
	struct greth_private *greth = netdev_priv(dev);
	int err;

	err = greth_init_rings(greth);
	if (err) {
		if (netif_msg_ifup(greth))
			dev_err(&dev->dev, "Could not allocate memory for DMA rings\n");
		return err;
	}

	err = request_irq(greth->irq, greth_interrupt, 0, "eth", (void *) dev);
	if (err) {
		if (netif_msg_ifup(greth))
			dev_err(&dev->dev, "Could not allocate interrupt %d\n", dev->irq);
		greth_clean_rings(greth);
		return err;
	}

	if (netif_msg_ifup(greth))
		dev_dbg(&dev->dev, " starting queue\n");
	netif_start_queue(dev);

	GRETH_REGSAVE(greth->regs->status, 0xFF);

	napi_enable(&greth->napi);

	greth_enable_irqs(greth);
	greth_enable_tx(greth);
	greth_enable_rx(greth);
	return 0;

}

开发者ID:513855417，项目名称:linux，代码行数:34，代码来源:greth.c

示例4: greth_clean_tx_gbit

static void greth_clean_tx_gbit(struct net_device *dev)
{
	struct greth_private *greth;
	struct greth_bd *bdp, *bdp_last_frag;
	struct sk_buff *skb;
	u32 stat;
	int nr_frags, i;

	greth = netdev_priv(dev);

	while (greth->tx_free < GRETH_TXBD_NUM) {

		skb = greth->tx_skbuff[greth->tx_last];

		nr_frags = skb_shinfo(skb)->nr_frags;

		/* We only clean fully completed SKBs */
		bdp_last_frag = greth->tx_bd_base + SKIP_TX(greth->tx_last, nr_frags);

		GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
		mb();
		stat = greth_read_bd(&bdp_last_frag->stat);

		if (stat & GRETH_BD_EN)
			break;

		greth->tx_skbuff[greth->tx_last] = NULL;

		greth_update_tx_stats(dev, stat);
		dev->stats.tx_bytes += skb->len;

		bdp = greth->tx_bd_base + greth->tx_last;

		greth->tx_last = NEXT_TX(greth->tx_last);

		dma_unmap_single(greth->dev,
				 greth_read_bd(&bdp->addr),
				 skb_headlen(skb),
				 DMA_TO_DEVICE);

		for (i = 0; i < nr_frags; i++) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
			bdp = greth->tx_bd_base + greth->tx_last;

			dma_unmap_page(greth->dev,
				       greth_read_bd(&bdp->addr),
				       frag->size,
				       DMA_TO_DEVICE);

			greth->tx_last = NEXT_TX(greth->tx_last);
		}
		greth->tx_free += nr_frags+1;
		dev_kfree_skb(skb);
	}

	if (netif_queue_stopped(dev) && (greth->tx_free > (MAX_SKB_FRAGS+1)))
		netif_wake_queue(dev);
}

开发者ID:CSCLOG，项目名称:beaglebone，代码行数:58，代码来源:greth.c

示例5: greth_set_mac_add

static int greth_set_mac_add(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;
	struct greth_private *greth;
	struct greth_regs *regs;

	greth = netdev_priv(dev);
	regs = greth->regs;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	GRETH_REGSAVE(regs->esa_msb, dev->dev_addr[0] << 8 | dev->dev_addr[1]);
	GRETH_REGSAVE(regs->esa_lsb, dev->dev_addr[2] << 24 | dev->dev_addr[3] << 16 |
		      dev->dev_addr[4] << 8 | dev->dev_addr[5]);

	return 0;
}

开发者ID:513855417，项目名称:linux，代码行数:19，代码来源:greth.c

示例6: read_mii

/* Read MII register 'addr' from core 'regs' */
static int read_mii(int phyaddr, int regaddr, volatile greth_regs * regs)
{
	while (GRETH_REGLOAD(&regs->mdio) & GRETH_MII_BUSY) {
	}

	GRETH_REGSAVE(&regs->mdio, ((phyaddr & 0x1F) << 11) | ((regaddr & 0x1F) << 6) | 2);

	while (GRETH_REGLOAD(&regs->mdio) & GRETH_MII_BUSY) {
	}

	if (!(GRETH_REGLOAD(&regs->mdio) & GRETH_MII_NVALID)) {
		return (GRETH_REGLOAD(&regs->mdio) >> 16) & 0xFFFF;
	} else {
		return -1;

开发者ID:bradbishop，项目名称:u-boot，代码行数:15，代码来源:greth.c

示例7: greth_clean_tx

static void greth_clean_tx(struct net_device *dev)
{
	struct greth_private *greth;
	struct greth_bd *bdp;
	u32 stat;

	greth = netdev_priv(dev);

	while (1) {
		bdp = greth->tx_bd_base + greth->tx_last;
		GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
		mb();
		stat = greth_read_bd(&bdp->stat);

		if (unlikely(stat & GRETH_BD_EN))
			break;

		if (greth->tx_free == GRETH_TXBD_NUM)
			break;

		/* Check status for errors */
		if (unlikely(stat & GRETH_TXBD_STATUS)) {
			dev->stats.tx_errors++;
			if (stat & GRETH_TXBD_ERR_AL)
				dev->stats.tx_aborted_errors++;
			if (stat & GRETH_TXBD_ERR_UE)
				dev->stats.tx_fifo_errors++;
		}
		dev->stats.tx_packets++;
		dev->stats.tx_bytes += greth->tx_bufs_length[greth->tx_last];
		greth->tx_last = NEXT_TX(greth->tx_last);
		greth->tx_free++;
	}

	if (greth->tx_free > 0) {
		netif_wake_queue(dev);
	}

}

开发者ID:CSCLOG，项目名称:beaglebone，代码行数:39，代码来源:greth.c

示例8: greth_rx_gbit

static int greth_rx_gbit(struct net_device *dev, int limit)
{
	struct greth_private *greth;
	struct greth_bd *bdp;
	struct sk_buff *skb, *newskb;
	int pkt_len;
	int bad, count = 0;
	u32 status, dma_addr;
	unsigned long flags;

	greth = netdev_priv(dev);

	for (count = 0; count < limit; ++count) {

		bdp = greth->rx_bd_base + greth->rx_cur;
		skb = greth->rx_skbuff[greth->rx_cur];
		GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
		mb();
		status = greth_read_bd(&bdp->stat);
		bad = 0;

		if (status & GRETH_BD_EN)
			break;

		/* Check status for errors. */
		if (unlikely(status & GRETH_RXBD_STATUS)) {

			if (status & GRETH_RXBD_ERR_FT) {
				dev->stats.rx_length_errors++;
				bad = 1;
			} else if (status &
				   (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE | GRETH_RXBD_ERR_LE)) {
				dev->stats.rx_frame_errors++;
				bad = 1;
			} else if (status & GRETH_RXBD_ERR_CRC) {
				dev->stats.rx_crc_errors++;
				bad = 1;
			}
		}

		/* Allocate new skb to replace current, not needed if the
		 * current skb can be reused */
		if (!bad && (newskb=netdev_alloc_skb(dev, MAX_FRAME_SIZE + NET_IP_ALIGN))) {
			skb_reserve(newskb, NET_IP_ALIGN);

			dma_addr = dma_map_single(greth->dev,
						      newskb->data,
						      MAX_FRAME_SIZE + NET_IP_ALIGN,
						      DMA_FROM_DEVICE);

			if (!dma_mapping_error(greth->dev, dma_addr)) {
				/* Process the incoming frame. */
				pkt_len = status & GRETH_BD_LEN;

				dma_unmap_single(greth->dev,
						 greth_read_bd(&bdp->addr),
						 MAX_FRAME_SIZE + NET_IP_ALIGN,
						 DMA_FROM_DEVICE);

				if (netif_msg_pktdata(greth))
					greth_print_rx_packet(phys_to_virt(greth_read_bd(&bdp->addr)), pkt_len);

				skb_put(skb, pkt_len);

				if (dev->features & NETIF_F_RXCSUM && hw_checksummed(status))
					skb->ip_summed = CHECKSUM_UNNECESSARY;
				else
					skb_checksum_none_assert(skb);

				skb->protocol = eth_type_trans(skb, dev);
				dev->stats.rx_packets++;
				dev->stats.rx_bytes += pkt_len;
				netif_receive_skb(skb);

				greth->rx_skbuff[greth->rx_cur] = newskb;
				greth_write_bd(&bdp->addr, dma_addr);
			} else {
				if (net_ratelimit())
					dev_warn(greth->dev, "Could not create DMA mapping, dropping packet\n");
				dev_kfree_skb(newskb);
				/* reusing current skb, so it is a drop */
				dev->stats.rx_dropped++;
			}
		} else if (bad) {
			/* Bad Frame transfer, the skb is reused */
			dev->stats.rx_dropped++;
		} else {
			/* Failed Allocating a new skb. This is rather stupid
			 * but the current "filled" skb is reused, as if
			 * transfer failure. One could argue that RX descriptor
			 * table handling should be divided into cleaning and
			 * filling as the TX part of the driver
			 */
			if (net_ratelimit())
				dev_warn(greth->dev, "Could not allocate SKB, dropping packet\n");
			/* reusing current skb, so it is a drop */
			dev->stats.rx_dropped++;
		}

		status = GRETH_BD_EN | GRETH_BD_IE;
//.........这里部分代码省略.........

开发者ID:513855417，项目名称:linux，代码行数:101，代码来源:greth.c

示例9: greth_rx

static int greth_rx(struct net_device *dev, int limit)
{
	struct greth_private *greth;
	struct greth_bd *bdp;
	struct sk_buff *skb;
	int pkt_len;
	int bad, count;
	u32 status, dma_addr;
	unsigned long flags;

	greth = netdev_priv(dev);

	for (count = 0; count < limit; ++count) {

		bdp = greth->rx_bd_base + greth->rx_cur;
		GRETH_REGSAVE(greth->regs->status, GRETH_INT_RE | GRETH_INT_RX);
		mb();
		status = greth_read_bd(&bdp->stat);

		if (unlikely(status & GRETH_BD_EN)) {
			break;
		}

		dma_addr = greth_read_bd(&bdp->addr);
		bad = 0;

		/* Check status for errors. */
		if (unlikely(status & GRETH_RXBD_STATUS)) {
			if (status & GRETH_RXBD_ERR_FT) {
				dev->stats.rx_length_errors++;
				bad = 1;
			}
			if (status & (GRETH_RXBD_ERR_AE | GRETH_RXBD_ERR_OE)) {
				dev->stats.rx_frame_errors++;
				bad = 1;
			}
			if (status & GRETH_RXBD_ERR_CRC) {
				dev->stats.rx_crc_errors++;
				bad = 1;
			}
		}
		if (unlikely(bad)) {
			dev->stats.rx_errors++;

		} else {

			pkt_len = status & GRETH_BD_LEN;

			skb = netdev_alloc_skb(dev, pkt_len + NET_IP_ALIGN);

			if (unlikely(skb == NULL)) {

				if (net_ratelimit())
					dev_warn(&dev->dev, "low on memory - " "packet dropped\n");

				dev->stats.rx_dropped++;

			} else {
				skb_reserve(skb, NET_IP_ALIGN);

				dma_sync_single_for_cpu(greth->dev,
							dma_addr,
							pkt_len,
							DMA_FROM_DEVICE);

				if (netif_msg_pktdata(greth))
					greth_print_rx_packet(phys_to_virt(dma_addr), pkt_len);

				memcpy(skb_put(skb, pkt_len), phys_to_virt(dma_addr), pkt_len);

				skb->protocol = eth_type_trans(skb, dev);
				dev->stats.rx_bytes += pkt_len;
				dev->stats.rx_packets++;
				netif_receive_skb(skb);
			}
		}

		status = GRETH_BD_EN | GRETH_BD_IE;
		if (greth->rx_cur == GRETH_RXBD_NUM_MASK) {
			status |= GRETH_BD_WR;
		}

		wmb();
		greth_write_bd(&bdp->stat, status);

		dma_sync_single_for_device(greth->dev, dma_addr, MAX_FRAME_SIZE, DMA_FROM_DEVICE);

		spin_lock_irqsave(&greth->devlock, flags); /* save from XMIT */
		greth_enable_rx(greth);
		spin_unlock_irqrestore(&greth->devlock, flags);

		greth->rx_cur = NEXT_RX(greth->rx_cur);
	}

	return count;
}

开发者ID:513855417，项目名称:linux，代码行数:96，代码来源:greth.c

示例10: greth_clean_tx_gbit

static void greth_clean_tx_gbit(struct net_device *dev)
{
	struct greth_private *greth;
	struct greth_bd *bdp, *bdp_last_frag;
	struct sk_buff *skb = NULL;
	u32 stat;
	int nr_frags, i;
	u16 tx_last;

	greth = netdev_priv(dev);
	tx_last = greth->tx_last;

	while (tx_last != greth->tx_next) {

		skb = greth->tx_skbuff[tx_last];

		nr_frags = skb_shinfo(skb)->nr_frags;

		/* We only clean fully completed SKBs */
		bdp_last_frag = greth->tx_bd_base + SKIP_TX(tx_last, nr_frags);

		GRETH_REGSAVE(greth->regs->status, GRETH_INT_TE | GRETH_INT_TX);
		mb();
		stat = greth_read_bd(&bdp_last_frag->stat);

		if (stat & GRETH_BD_EN)
			break;

		greth->tx_skbuff[tx_last] = NULL;

		greth_update_tx_stats(dev, stat);
		dev->stats.tx_bytes += skb->len;

		bdp = greth->tx_bd_base + tx_last;

		tx_last = NEXT_TX(tx_last);

		dma_unmap_single(greth->dev,
				 greth_read_bd(&bdp->addr),
				 skb_headlen(skb),
				 DMA_TO_DEVICE);

		for (i = 0; i < nr_frags; i++) {
			skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
			bdp = greth->tx_bd_base + tx_last;

			dma_unmap_page(greth->dev,
				       greth_read_bd(&bdp->addr),
				       skb_frag_size(frag),
				       DMA_TO_DEVICE);

			tx_last = NEXT_TX(tx_last);
		}
		dev_kfree_skb(skb);
	}
	if (skb) { /* skb is set only if the above while loop was entered */
		wmb();
		greth->tx_last = tx_last;

		if (netif_queue_stopped(dev) &&
		    (greth_num_free_bds(tx_last, greth->tx_next) >
		    (MAX_SKB_FRAGS+1)))
			netif_wake_queue(dev);
	}
}

开发者ID:513855417，项目名称:linux，代码行数:65，代码来源:greth.c

示例11: greth_init_rings

static int greth_init_rings(struct greth_private *greth)
{
	struct sk_buff *skb;
	struct greth_bd *rx_bd, *tx_bd;
	u32 dma_addr;
	int i;

	rx_bd = greth->rx_bd_base;
	tx_bd = greth->tx_bd_base;

	/* Initialize descriptor rings and buffers */
	if (greth->gbit_mac) {

		for (i = 0; i < GRETH_RXBD_NUM; i++) {
			skb = netdev_alloc_skb(greth->netdev, MAX_FRAME_SIZE+NET_IP_ALIGN);
			if (skb == NULL) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Error allocating DMA ring.\n");
				goto cleanup;
			}
			skb_reserve(skb, NET_IP_ALIGN);
			dma_addr = dma_map_single(greth->dev,
						  skb->data,
						  MAX_FRAME_SIZE+NET_IP_ALIGN,
						  DMA_FROM_DEVICE);

			if (dma_mapping_error(greth->dev, dma_addr)) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Could not create initial DMA mapping\n");
				goto cleanup;
			}
			greth->rx_skbuff[i] = skb;
			greth_write_bd(&rx_bd[i].addr, dma_addr);
			greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
		}

	} else {

		/* 10/100 MAC uses a fixed set of buffers and copy to/from SKBs */
		for (i = 0; i < GRETH_RXBD_NUM; i++) {

			greth->rx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);

			if (greth->rx_bufs[i] == NULL) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Error allocating DMA ring.\n");
				goto cleanup;
			}

			dma_addr = dma_map_single(greth->dev,
						  greth->rx_bufs[i],
						  MAX_FRAME_SIZE,
						  DMA_FROM_DEVICE);

			if (dma_mapping_error(greth->dev, dma_addr)) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Could not create initial DMA mapping\n");
				goto cleanup;
			}
			greth_write_bd(&rx_bd[i].addr, dma_addr);
			greth_write_bd(&rx_bd[i].stat, GRETH_BD_EN | GRETH_BD_IE);
		}
		for (i = 0; i < GRETH_TXBD_NUM; i++) {

			greth->tx_bufs[i] = kmalloc(MAX_FRAME_SIZE, GFP_KERNEL);

			if (greth->tx_bufs[i] == NULL) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Error allocating DMA ring.\n");
				goto cleanup;
			}

			dma_addr = dma_map_single(greth->dev,
						  greth->tx_bufs[i],
						  MAX_FRAME_SIZE,
						  DMA_TO_DEVICE);

			if (dma_mapping_error(greth->dev, dma_addr)) {
				if (netif_msg_ifup(greth))
					dev_err(greth->dev, "Could not create initial DMA mapping\n");
				goto cleanup;
			}
			greth_write_bd(&tx_bd[i].addr, dma_addr);
			greth_write_bd(&tx_bd[i].stat, 0);
		}
	}
	greth_write_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat,
		       greth_read_bd(&rx_bd[GRETH_RXBD_NUM - 1].stat) | GRETH_BD_WR);

	/* Initialize pointers. */
	greth->rx_cur = 0;
	greth->tx_next = 0;
	greth->tx_last = 0;
	greth->tx_free = GRETH_TXBD_NUM;

	/* Initialize descriptor base address */
	GRETH_REGSAVE(greth->regs->tx_desc_p, greth->tx_bd_base_phys);
	GRETH_REGSAVE(greth->regs->rx_desc_p, greth->rx_bd_base_phys);

	return 0;
//.........这里部分代码省略.........

开发者ID:513855417，项目名称:linux，代码行数:101，代码来源:greth.c

示例12: greth_start_xmit_gbit

static netdev_tx_t
greth_start_xmit_gbit(struct sk_buff *skb, struct net_device *dev)
{
	struct greth_private *greth = netdev_priv(dev);
	struct greth_bd *bdp;
	u32 status = 0, dma_addr, ctrl;
	int curr_tx, nr_frags, i, err = NETDEV_TX_OK;
	unsigned long flags;

	nr_frags = skb_shinfo(skb)->nr_frags;

	/* Clean TX Ring */
	greth_clean_tx_gbit(dev);

	if (greth->tx_free < nr_frags + 1) {
		spin_lock_irqsave(&greth->devlock, flags);/*save from poll/irq*/
		ctrl = GRETH_REGLOAD(greth->regs->control);
		/* Enable TX IRQ only if not already in poll() routine */
		if (ctrl & GRETH_RXI)
			GRETH_REGSAVE(greth->regs->control, ctrl | GRETH_TXI);
		netif_stop_queue(dev);
		spin_unlock_irqrestore(&greth->devlock, flags);
		err = NETDEV_TX_BUSY;
		goto out;
	}

	if (netif_msg_pktdata(greth))
		greth_print_tx_packet(skb);

	if (unlikely(skb->len > MAX_FRAME_SIZE)) {
		dev->stats.tx_errors++;
		goto out;
	}

	/* Save skb pointer. */
	greth->tx_skbuff[greth->tx_next] = skb;

	/* Linear buf */
	if (nr_frags != 0)
		status = GRETH_TXBD_MORE;

	if (skb->ip_summed == CHECKSUM_PARTIAL)
		status |= GRETH_TXBD_CSALL;
	status |= skb_headlen(skb) & GRETH_BD_LEN;
	if (greth->tx_next == GRETH_TXBD_NUM_MASK)
		status |= GRETH_BD_WR;


	bdp = greth->tx_bd_base + greth->tx_next;
	greth_write_bd(&bdp->stat, status);
	dma_addr = dma_map_single(greth->dev, skb->data, skb_headlen(skb), DMA_TO_DEVICE);

	if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
		goto map_error;

	greth_write_bd(&bdp->addr, dma_addr);

	curr_tx = NEXT_TX(greth->tx_next);

	/* Frags */
	for (i = 0; i < nr_frags; i++) {
		skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
		greth->tx_skbuff[curr_tx] = NULL;
		bdp = greth->tx_bd_base + curr_tx;

		status = GRETH_BD_EN;
		if (skb->ip_summed == CHECKSUM_PARTIAL)
			status |= GRETH_TXBD_CSALL;
		status |= frag->size & GRETH_BD_LEN;

		/* Wrap around descriptor ring */
		if (curr_tx == GRETH_TXBD_NUM_MASK)
			status |= GRETH_BD_WR;

		/* More fragments left */
		if (i < nr_frags - 1)
			status |= GRETH_TXBD_MORE;
		else
			status |= GRETH_BD_IE; /* enable IRQ on last fragment */

		greth_write_bd(&bdp->stat, status);

		dma_addr = dma_map_page(greth->dev,
					frag->page,
					frag->page_offset,
					frag->size,
					DMA_TO_DEVICE);

		if (unlikely(dma_mapping_error(greth->dev, dma_addr)))
			goto frag_map_error;

		greth_write_bd(&bdp->addr, dma_addr);

		curr_tx = NEXT_TX(curr_tx);
	}

	wmb();

	/* Enable the descriptor chain by enabling the first descriptor */
	bdp = greth->tx_bd_base + greth->tx_next;
//.........这里部分代码省略.........

开发者ID:CSCLOG，项目名称:beaglebone，代码行数:101，代码来源:greth.c

注：本文中的GRETH_REGSAVE函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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C++ GRETH_REGSAVE函数代码示例

示例1: greth_poll

示例2: greth_start_xmit

示例3: greth_open

示例4: greth_clean_tx_gbit

示例5: greth_set_mac_add

示例6: read_mii

示例7: greth_clean_tx

示例8: greth_rx_gbit

示例9: greth_rx

示例10: greth_clean_tx_gbit

示例11: greth_init_rings

示例12: greth_start_xmit_gbit

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