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https://github.com/openwrt/openwrt.git
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f1ad6d3768
SVN-Revision: 18152
406 lines
11 KiB
C
406 lines
11 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) 2009 John Crispin <blogic@openwrt.org>
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*/
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/if_vlan.h>
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#include <linux/if_ether.h>
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#include <linux/platform_device.h>
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#include <asm/uaccess.h>
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#include <net/sock.h>
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#include <asm/uaccess.h>
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#include <eth.h>
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#define TX_TIMEOUT (20 * HZ / 100)
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#define MAX_RX_LENGTH 1500
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#ifdef CONFIG_RALINK_RT305X
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#include "ramips_esw.c"
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#endif
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#define phys_to_bus(a) (a & 0x1FFFFFFF)
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static struct net_device * ramips_dev;
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static void __iomem *ramips_fe_base = 0;
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static inline void
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ramips_fe_wr(u32 val, unsigned reg)
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{
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__raw_writel(val, ramips_fe_base + reg);
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}
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static inline u32
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ramips_fe_rr(unsigned reg)
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{
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return __raw_readl(ramips_fe_base + reg);
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}
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static int
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ramips_alloc_dma(struct net_device *dev)
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{
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struct raeth_priv *priv = netdev_priv(dev);
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int i;
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priv->skb_free_idx = 0;
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/* setup tx ring */
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priv->tx = dma_alloc_coherent(NULL,
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NUM_TX_DESC * sizeof(struct ramips_tx_dma), &priv->phy_tx, GFP_ATOMIC);
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for(i = 0; i < NUM_TX_DESC; i++)
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{
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memset(&priv->tx[i], 0, sizeof(struct ramips_tx_dma));
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priv->tx[i].txd2 |= TX_DMA_LSO | TX_DMA_DONE;
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priv->tx[i].txd4 &= (TX_DMA_QN_MASK | TX_DMA_PN_MASK);
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priv->tx[i].txd4 |= TX_DMA_QN(3) | TX_DMA_PN(1);
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}
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ramips_fe_wr(phys_to_bus(priv->phy_tx), RAMIPS_TX_BASE_PTR0);
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ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
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ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
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ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
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/* setup rx ring */
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priv->rx = dma_alloc_coherent(NULL,
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NUM_RX_DESC * sizeof(struct ramips_rx_dma), &priv->phy_rx, GFP_ATOMIC);
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memset(priv->rx, 0, sizeof(struct ramips_rx_dma) * NUM_RX_DESC);
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for(i = 0; i < NUM_RX_DESC; i++)
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{
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struct sk_buff *new_skb = dev_alloc_skb(MAX_RX_LENGTH + 2);
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BUG_ON(!new_skb);
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skb_reserve(new_skb, 2);
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priv->rx[i].rxd1 =
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dma_map_single(NULL, skb_put(new_skb, 2), MAX_RX_LENGTH + 2,
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PCI_DMA_FROMDEVICE);
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priv->rx[i].rxd2 |= RX_DMA_LSO;
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priv->rx_skb[i] = new_skb;
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}
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ramips_fe_wr(phys_to_bus(priv->phy_rx), RAMIPS_RX_BASE_PTR0);
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ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
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ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
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ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
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return 0;
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}
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static int
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ramips_eth_hard_start_xmit(struct sk_buff* skb, struct net_device *dev)
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{
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struct raeth_priv *priv = netdev_priv(dev);
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unsigned long tx;
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unsigned int tx_next;
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unsigned int mapped_addr;
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if(priv->plat->min_pkt_len)
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{
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if(skb->len < priv->plat->min_pkt_len)
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{
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if(skb_padto(skb, priv->plat->min_pkt_len))
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{
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printk(KERN_ERR "ramips_eth: skb_padto failed\n");
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kfree_skb(skb);
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return 0;
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}
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skb_put(skb, priv->plat->min_pkt_len - skb->len);
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}
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}
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dev->trans_start = jiffies;
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mapped_addr = (unsigned int)dma_map_single(NULL, skb->data, skb->len,
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PCI_DMA_TODEVICE);
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dma_sync_single_for_device(NULL, mapped_addr, skb->len, PCI_DMA_TODEVICE);
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tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
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if(tx == NUM_TX_DESC - 1)
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tx_next = 0;
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else
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tx_next = tx + 1;
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if((priv->tx_skb[tx]== 0) && (priv->tx_skb[tx_next] == 0))
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{
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if(!(priv->tx[tx].txd2 & TX_DMA_DONE))
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{
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kfree_skb(skb);
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dev->stats.tx_dropped++;
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printk(KERN_ERR "%s: dropping\n", dev->name);
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return 0;
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}
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priv->tx[tx].txd1 = virt_to_phys(skb->data);
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priv->tx[tx].txd2 &= ~(TX_DMA_PLEN0_MASK | TX_DMA_DONE);
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priv->tx[tx].txd2 |= TX_DMA_PLEN0(skb->len);
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ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
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dev->stats.tx_packets++;
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dev->stats.tx_bytes += skb->len;
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priv->tx_skb[tx] = skb;
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ramips_fe_wr((tx + 1) % NUM_TX_DESC, RAMIPS_TX_CTX_IDX0);
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} else {
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dev->stats.tx_dropped++;
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kfree_skb(skb);
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}
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return 0;
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}
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static void
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ramips_eth_rx_hw(unsigned long ptr)
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{
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struct net_device *dev = (struct net_device*)ptr;
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struct raeth_priv *priv = netdev_priv(dev);
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int rx;
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int max_rx = 16;
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while(max_rx)
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{
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struct sk_buff *rx_skb, *new_skb;
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rx = (ramips_fe_rr(RAMIPS_RX_CALC_IDX0) + 1) % NUM_RX_DESC;
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if(!(priv->rx[rx].rxd2 & RX_DMA_DONE))
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break;
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max_rx--;
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rx_skb = priv->rx_skb[rx];
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rx_skb->len = RX_DMA_PLEN0(priv->rx[rx].rxd2);
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rx_skb->tail = rx_skb->data + rx_skb->len;
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rx_skb->dev = dev;
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rx_skb->protocol = eth_type_trans(rx_skb, dev);
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rx_skb->ip_summed = CHECKSUM_NONE;
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dev->stats.rx_packets++;
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dev->stats.rx_bytes += rx_skb->len;
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netif_rx(rx_skb);
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new_skb = __dev_alloc_skb(MAX_RX_LENGTH + 2, GFP_DMA | GFP_ATOMIC);
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priv->rx_skb[rx] = new_skb;
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BUG_ON(!new_skb);
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skb_reserve(new_skb, 2);
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priv->rx[rx].rxd1 =
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dma_map_single(NULL, new_skb->data, MAX_RX_LENGTH + 2,
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PCI_DMA_FROMDEVICE);
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priv->rx[rx].rxd2 &= ~RX_DMA_DONE;
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ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
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}
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if(max_rx == 0)
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tasklet_schedule(&priv->rx_tasklet);
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else
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ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_RX_DLY_INT,
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RAMIPS_FE_INT_ENABLE);
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}
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static void
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ramips_eth_tx_housekeeping(unsigned long ptr)
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{
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struct net_device *dev = (struct net_device*)ptr;
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struct raeth_priv *priv = netdev_priv(dev);
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while((priv->tx[priv->skb_free_idx].txd2 & TX_DMA_DONE) &&
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(priv->tx_skb[priv->skb_free_idx]))
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{
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dev_kfree_skb_irq((struct sk_buff*)priv->tx_skb[priv->skb_free_idx]);
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priv->tx_skb[priv->skb_free_idx] = 0;
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priv->skb_free_idx++;
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if(priv->skb_free_idx >= NUM_TX_DESC)
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priv->skb_free_idx = 0;
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}
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ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | RAMIPS_TX_DLY_INT,
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RAMIPS_FE_INT_ENABLE);
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}
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static int
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ramips_eth_set_mac_addr(struct net_device *dev, void *priv)
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{
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unsigned char *mac = (unsigned char*)priv;
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if(netif_running(dev))
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return -EBUSY;
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memcpy(dev->dev_addr, ((struct sockaddr*)priv)->sa_data, dev->addr_len);
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ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
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ramips_fe_wr(RAMIPS_GDMA1_MAC_ADRL,
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(mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5]);
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return 0;
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}
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static void
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ramips_eth_timeout(struct net_device *dev)
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{
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struct raeth_priv *priv = netdev_priv(dev);
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tasklet_schedule(&priv->tx_housekeeping_tasklet);
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}
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static irqreturn_t
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ramips_eth_irq(int irq, void *dev)
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{
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struct raeth_priv *priv = netdev_priv(dev);
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unsigned long fe_int = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
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ramips_fe_wr(0xFFFFFFFF, RAMIPS_FE_INT_STATUS);
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if(fe_int & RAMIPS_RX_DLY_INT)
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{
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ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~(RAMIPS_RX_DLY_INT),
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RAMIPS_FE_INT_ENABLE);
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tasklet_schedule(&priv->rx_tasklet);
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}
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if(fe_int & RAMIPS_TX_DLY_INT)
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ramips_eth_tx_housekeeping((unsigned long)dev);
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return IRQ_HANDLED;
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}
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static int
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ramips_eth_open(struct net_device *dev)
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{
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struct raeth_priv *priv = netdev_priv(dev);
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ramips_alloc_dma(dev);
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ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
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(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
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RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
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RAMIPS_PDMA_GLO_CFG);
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ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
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~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
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((rt305x_sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
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RAMIPS_FE_GLO_CFG);
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request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED, dev->name, dev);
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tasklet_init(&priv->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
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(unsigned long)dev);
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tasklet_init(&priv->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
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ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
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ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
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ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
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~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
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RAMIPS_GDMA1_FWD_CFG);
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ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
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~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
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RAMIPS_CDMA_CSG_CFG);
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ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
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ramips_fe_wr(1, RAMIPS_FE_RST_GL);
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ramips_fe_wr(0, RAMIPS_FE_RST_GL);
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netif_start_queue(dev);
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return 0;
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}
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static int
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ramips_eth_stop(struct net_device *dev)
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{
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struct raeth_priv *priv = netdev_priv(dev);
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ramips_fe_wr(RAMIPS_PDMA_GLO_CFG, ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
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~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN));
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free_irq(dev->irq, dev);
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netif_stop_queue(dev);
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tasklet_kill(&priv->tx_housekeeping_tasklet);
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tasklet_kill(&priv->rx_tasklet);
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pci_free_consistent(NULL, NUM_TX_DESC * sizeof(struct ramips_tx_dma),
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priv->tx, priv->phy_tx);
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pci_free_consistent(NULL, NUM_RX_DESC * sizeof(struct ramips_rx_dma),
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priv->rx, priv->phy_rx);
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printk(KERN_DEBUG "ramips_eth: stopped\n");
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return 0;
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}
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static int __init
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ramips_eth_probe(struct net_device *dev)
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{
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struct raeth_priv *priv = netdev_priv(dev);
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struct sockaddr addr;
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BUG_ON(!priv->plat->reset_fe);
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priv->plat->reset_fe();
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net_srandom(jiffies);
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memcpy(addr.sa_data, priv->plat->mac, 6);
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ramips_eth_set_mac_addr(dev, &addr);
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ether_setup(dev);
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dev->open = ramips_eth_open;
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dev->stop = ramips_eth_stop;
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dev->hard_start_xmit = ramips_eth_hard_start_xmit;
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dev->set_mac_address = ramips_eth_set_mac_addr;
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dev->mtu = MAX_RX_LENGTH;
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dev->tx_timeout = ramips_eth_timeout;
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dev->watchdog_timeo = TX_TIMEOUT;
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return 0;
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}
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static int
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ramips_eth_plat_probe(struct platform_device *plat)
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{
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struct raeth_priv *priv;
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struct ramips_eth_platform_data *data = plat->dev.platform_data;
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ramips_fe_base = ioremap_nocache(data->base_addr, PAGE_SIZE);
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if(!ramips_fe_base)
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return -ENOMEM;
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ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
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if(!ramips_dev)
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return -ENOMEM;
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strcpy(ramips_dev->name, "eth%d");
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ramips_dev->irq = data->irq;
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ramips_dev->addr_len = ETH_ALEN;
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ramips_dev->base_addr = (unsigned long)ramips_fe_base;
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ramips_dev->init = ramips_eth_probe;
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priv = (struct raeth_priv*)netdev_priv(ramips_dev);
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priv->plat = data;
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if(register_netdev(ramips_dev))
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{
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printk(KERN_ERR "ramips_eth: error bringing up device\n");
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return -ENXIO;
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}
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#ifdef CONFIG_RALINK_RT305X
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rt305x_esw_init();
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#endif
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printk(KERN_DEBUG "ramips_eth: loaded\n");
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return 0;
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}
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static int
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ramips_eth_plat_remove(struct platform_device *plat)
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{
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unregister_netdev(ramips_dev);
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free_netdev(ramips_dev);
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printk(KERN_DEBUG "ramips_eth: unloaded\n");
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return 0;
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}
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static struct platform_driver ramips_eth_driver = {
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.probe = ramips_eth_plat_probe,
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.remove = ramips_eth_plat_remove,
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.driver = {
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.name = "ramips_eth",
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.owner = THIS_MODULE,
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},
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};
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static int __init
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ramips_eth_init(void)
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{
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int ret = platform_driver_register(&ramips_eth_driver);
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if (ret)
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printk(KERN_ERR
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"ramips_eth: Error registering platfom driver!\n");
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return ret;
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}
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static void __exit
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ramips_eth_cleanup(void)
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{
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platform_driver_unregister(&ramips_eth_driver);
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}
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module_init(ramips_eth_init);
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module_exit(ramips_eth_cleanup);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
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MODULE_DESCRIPTION("ethernet driver for ramips boards");
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