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[PATCH][MIPS] AR7 ethernet

To: linux-mips@linux-mips.org
Subject: [PATCH][MIPS] AR7 ethernet
From: Matteo Croce <technoboy85@gmail.com>
Date: Sun, 14 Oct 2007 18:10:13 +0200
Cc: Eugene Konev <ejka@imfi.kspu.ru>, netdev@vger.kernel.org, davem@davemloft.net, kuznet@ms2.inr.ac.ru, pekkas@netcore.fi, jmorris@namei.org, yoshfuji@linux-ipv6.org, kaber@coreworks.de, Andrew Morton <akpm@linux-foundation.org>, Jeff Garzik <jgarzik@pobox.com>
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New version which uses less locking and drops old API

Signed-off-by: Matteo Croce <technoboy85@gmail.com>
Signed-off-by: Eugene Konev <ejka@imfi.kspu.ru>
Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index e412582..5ab5d5b 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1780,6 +1780,15 @@ config SC92031
          To compile this driver as a module, choose M here: the module
          will be called sc92031.  This is recommended.
 
+config CPMAC
+       tristate "TI AR7 CPMAC Ethernet support (EXPERIMENTAL)"
+       depends on NET_ETHERNET && EXPERIMENTAL && AR7
+       select PHYLIB
+       select FIXED_PHY
+       select FIXED_MII_100_FDX
+       help
+         TI AR7 CPMAC Ethernet support
+
 config NET_POCKET
        bool "Pocket and portable adapters"
        depends on PARPORT
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index e14bf49..411fcd8 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -161,6 +161,7 @@ obj-$(CONFIG_8139CP) += 8139cp.o
 obj-$(CONFIG_8139TOO) += 8139too.o
 obj-$(CONFIG_ZNET) += znet.o
 obj-$(CONFIG_LAN_SAA9730) += saa9730.o
+obj-$(CONFIG_CPMAC) += cpmac.o
 obj-$(CONFIG_DEPCA) += depca.o
 obj-$(CONFIG_EWRK3) += ewrk3.o
 obj-$(CONFIG_ATP) += atp.o
diff --git a/drivers/net/cpmac.c b/drivers/net/cpmac.c
new file mode 100644
index 0000000..ed53aaa
--- /dev/null
+++ b/drivers/net/cpmac.c
@@ -0,0 +1,1174 @@
+/*
+ * Copyright (C) 2006, 2007 Eugene Konev
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/version.h>
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/skbuff.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <asm/gpio.h>
+
+MODULE_AUTHOR("Eugene Konev <ejka@imfi.kspu.ru>");
+MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)");
+MODULE_LICENSE("GPL");
+
+static int debug_level = 8;
+static int dumb_switch;
+
+/* Next 2 are only used in cpmac_probe, so it's pointless to change them */
+module_param(debug_level, int, 0444);
+module_param(dumb_switch, int, 0444);
+
+MODULE_PARM_DESC(debug_level, "Number of NETIF_MSG bits to enable");
+MODULE_PARM_DESC(dumb_switch, "Assume switch is not connected to MDIO bus");
+
+#define CPMAC_VERSION "0.5.0"
+/* stolen from net/ieee80211.h */
+#ifndef MAC_FMT
+#define MAC_FMT "%02x:%02x:%02x:%02x:%02x:%02x"
+#define MAC_ARG(x) ((u8*)(x))[0], ((u8*)(x))[1], ((u8*)(x))[2], \
+                  ((u8*)(x))[3], ((u8*)(x))[4], ((u8*)(x))[5]
+#endif
+/* frame size + 802.1q tag */
+#define CPMAC_SKB_SIZE         (ETH_FRAME_LEN + 4)
+#define CPMAC_QUEUES   8
+
+/* Ethernet registers */
+#define CPMAC_TX_CONTROL               0x0004
+#define CPMAC_TX_TEARDOWN              0x0008
+#define CPMAC_RX_CONTROL               0x0014
+#define CPMAC_RX_TEARDOWN              0x0018
+#define CPMAC_MBP                      0x0100
+# define MBP_RXPASSCRC                 0x40000000
+# define MBP_RXQOS                     0x20000000
+# define MBP_RXNOCHAIN                 0x10000000
+# define MBP_RXCMF                     0x01000000
+# define MBP_RXSHORT                   0x00800000
+# define MBP_RXCEF                     0x00400000
+# define MBP_RXPROMISC                 0x00200000
+# define MBP_PROMISCCHAN(channel)      (((channel) & 0x7) << 16)
+# define MBP_RXBCAST                   0x00002000
+# define MBP_BCASTCHAN(channel)                (((channel) & 0x7) << 8)
+# define MBP_RXMCAST                   0x00000020
+# define MBP_MCASTCHAN(channel)                ((channel) & 0x7)
+#define CPMAC_UNICAST_ENABLE           0x0104
+#define CPMAC_UNICAST_CLEAR            0x0108
+#define CPMAC_MAX_LENGTH               0x010c
+#define CPMAC_BUFFER_OFFSET            0x0110
+#define CPMAC_MAC_CONTROL              0x0160
+# define MAC_TXPTYPE                   0x00000200
+# define MAC_TXPACE                    0x00000040
+# define MAC_MII                       0x00000020
+# define MAC_TXFLOW                    0x00000010
+# define MAC_RXFLOW                    0x00000008
+# define MAC_MTEST                     0x00000004
+# define MAC_LOOPBACK                  0x00000002
+# define MAC_FDX                       0x00000001
+#define CPMAC_MAC_STATUS               0x0164
+# define MAC_STATUS_QOS                        0x00000004
+# define MAC_STATUS_RXFLOW             0x00000002
+# define MAC_STATUS_TXFLOW             0x00000001
+#define CPMAC_TX_INT_ENABLE            0x0178
+#define CPMAC_TX_INT_CLEAR             0x017c
+#define CPMAC_MAC_INT_VECTOR           0x0180
+# define MAC_INT_STATUS                        0x00080000
+# define MAC_INT_HOST                  0x00040000
+# define MAC_INT_RX                    0x00020000
+# define MAC_INT_TX                    0x00010000
+#define CPMAC_MAC_EOI_VECTOR           0x0184
+#define CPMAC_RX_INT_ENABLE            0x0198
+#define CPMAC_RX_INT_CLEAR             0x019c
+#define CPMAC_MAC_INT_ENABLE           0x01a8
+#define CPMAC_MAC_INT_CLEAR            0x01ac
+#define CPMAC_MAC_ADDR_LO(channel)     (0x01b0 + (channel) * 4)
+#define CPMAC_MAC_ADDR_MID             0x01d0
+#define CPMAC_MAC_ADDR_HI              0x01d4
+#define CPMAC_MAC_HASH_LO              0x01d8
+#define CPMAC_MAC_HASH_HI              0x01dc
+#define CPMAC_TX_PTR(channel)          (0x0600 + (channel) * 4)
+#define CPMAC_RX_PTR(channel)          (0x0620 + (channel) * 4)
+#define CPMAC_TX_ACK(channel)          (0x0640 + (channel) * 4)
+#define CPMAC_RX_ACK(channel)          (0x0660 + (channel) * 4)
+#define CPMAC_REG_END                  0x0680
+/*
+ * Rx/Tx statistics
+ * TODO: use some of them to fill stats in cpmac_stats()
+ */
+#define CPMAC_STATS_RX_GOOD            0x0200
+#define CPMAC_STATS_RX_BCAST           0x0204
+#define CPMAC_STATS_RX_MCAST           0x0208
+#define CPMAC_STATS_RX_PAUSE           0x020c
+#define CPMAC_STATS_RX_CRC             0x0210
+#define CPMAC_STATS_RX_ALIGN           0x0214
+#define CPMAC_STATS_RX_OVER            0x0218
+#define CPMAC_STATS_RX_JABBER          0x021c
+#define CPMAC_STATS_RX_UNDER           0x0220
+#define CPMAC_STATS_RX_FRAG            0x0224
+#define CPMAC_STATS_RX_FILTER          0x0228
+#define CPMAC_STATS_RX_QOSFILTER       0x022c
+#define CPMAC_STATS_RX_OCTETS          0x0230
+
+#define CPMAC_STATS_TX_GOOD            0x0234
+#define CPMAC_STATS_TX_BCAST           0x0238
+#define CPMAC_STATS_TX_MCAST           0x023c
+#define CPMAC_STATS_TX_PAUSE           0x0240
+#define CPMAC_STATS_TX_DEFER           0x0244
+#define CPMAC_STATS_TX_COLLISION       0x0248
+#define CPMAC_STATS_TX_SINGLECOLL      0x024c
+#define CPMAC_STATS_TX_MULTICOLL       0x0250
+#define CPMAC_STATS_TX_EXCESSCOLL      0x0254
+#define CPMAC_STATS_TX_LATECOLL                0x0258
+#define CPMAC_STATS_TX_UNDERRUN                0x025c
+#define CPMAC_STATS_TX_CARRIERSENSE    0x0260
+#define CPMAC_STATS_TX_OCTETS          0x0264
+
+#define cpmac_read(base, reg)          (readl((void __iomem *)(base) + (reg)))
+#define cpmac_write(base, reg, val)    (writel(val, (void __iomem *)(base) + \
+                                               (reg)))
+
+/* MDIO bus */
+#define CPMAC_MDIO_VERSION             0x0000
+#define CPMAC_MDIO_CONTROL             0x0004
+# define MDIOC_IDLE                    0x80000000
+# define MDIOC_ENABLE                  0x40000000
+# define MDIOC_PREAMBLE                        0x00100000
+# define MDIOC_FAULT                   0x00080000
+# define MDIOC_FAULTDETECT             0x00040000
+# define MDIOC_INTTEST                 0x00020000
+# define MDIOC_CLKDIV(div)             ((div) & 0xff)
+#define CPMAC_MDIO_ALIVE               0x0008
+#define CPMAC_MDIO_LINK                        0x000c
+#define CPMAC_MDIO_ACCESS(channel)     (0x0080 + (channel) * 8)
+# define MDIO_BUSY                     0x80000000
+# define MDIO_WRITE                    0x40000000
+# define MDIO_REG(reg)                 (((reg) & 0x1f) << 21)
+# define MDIO_PHY(phy)                 (((phy) & 0x1f) << 16)
+# define MDIO_DATA(data)               ((data) & 0xffff)
+#define CPMAC_MDIO_PHYSEL(channel)     (0x0084 + (channel) * 8)
+# define PHYSEL_LINKSEL                        0x00000040
+# define PHYSEL_LINKINT                        0x00000020
+
+struct cpmac_desc {
+       u32 hw_next;
+       u32 hw_data;
+       u16 buflen;
+       u16 bufflags;
+       u16 datalen;
+       u16 dataflags;
+#define CPMAC_SOP                      0x8000
+#define CPMAC_EOP                      0x4000
+#define CPMAC_OWN                      0x2000
+#define CPMAC_EOQ                      0x1000
+       struct sk_buff *skb;
+       struct cpmac_desc *next;
+       dma_addr_t mapping;
+       dma_addr_t data_mapping;
+};
+
+struct cpmac_priv {
+       spinlock_t lock;
+       spinlock_t rx_lock;
+       struct cpmac_desc *rx_head;
+       int ring_size;
+       struct cpmac_desc *desc_ring;
+       dma_addr_t dma_ring;
+       void __iomem *regs;
+       struct mii_bus *mii_bus;
+       struct phy_device *phy;
+       char phy_name[BUS_ID_SIZE];
+       int oldlink, oldspeed, oldduplex;
+       u32 msg_enable;
+       struct net_device *dev;
+       struct work_struct reset_work;
+       struct platform_device *pdev;
+};
+
+static irqreturn_t cpmac_irq(int, void *);
+static void cpmac_hw_start(struct net_device *dev);
+static void cpmac_hw_stop(struct net_device *dev);
+static int cpmac_stop(struct net_device *dev);
+static int cpmac_open(struct net_device *dev);
+
+static void cpmac_dump_regs(struct net_device *dev)
+{
+       int i;
+       struct cpmac_priv *priv = netdev_priv(dev);
+       for (i = 0; i < CPMAC_REG_END; i += 4) {
+               if (i % 16 == 0) {
+                       if (i)
+                               printk("\n");
+                       printk(KERN_DEBUG "%s: reg[%p]:", dev->name,
+                              priv->regs + i);
+               }
+               printk(" %08x", cpmac_read(priv->regs, i));
+       }
+       printk("\n");
+}
+
+static void cpmac_dump_desc(struct net_device *dev, struct cpmac_desc *desc)
+{
+       int i;
+       printk(KERN_DEBUG "%s: desc[%p]:", dev->name, desc);
+       for (i = 0; i < sizeof(*desc) / 4; i++)
+               printk(" %08x", ((u32 *)desc)[i]);
+       printk("\n");
+}
+
+static void cpmac_dump_skb(struct net_device *dev, struct sk_buff *skb)
+{
+       int i;
+       printk(KERN_DEBUG "%s: skb 0x%p, len=%d\n", dev->name, skb, skb->len);
+       for (i = 0; i < skb->len; i++) {
+               if (i % 16 == 0) {
+                       if (i)
+                               printk("\n");
+                       printk(KERN_DEBUG "%s: data[%p]:", dev->name,
+                              skb->data + i);
+               }
+               printk(" %02x", ((u8 *)skb->data)[i]);
+       }
+       printk("\n");
+}
+
+static int cpmac_mdio_read(struct mii_bus *bus, int phy_id, int reg)
+{
+       u32 val;
+
+       while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
+               cpu_relax();
+       cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_REG(reg) |
+                   MDIO_PHY(phy_id));
+       while ((val = cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0))) & MDIO_BUSY)
+               cpu_relax();
+       return MDIO_DATA(val);
+}
+
+static int cpmac_mdio_write(struct mii_bus *bus, int phy_id,
+                           int reg, u16 val)
+{
+       while (cpmac_read(bus->priv, CPMAC_MDIO_ACCESS(0)) & MDIO_BUSY)
+               cpu_relax();
+       cpmac_write(bus->priv, CPMAC_MDIO_ACCESS(0), MDIO_BUSY | MDIO_WRITE |
+                   MDIO_REG(reg) | MDIO_PHY(phy_id) | MDIO_DATA(val));
+       return 0;
+}
+
+static int cpmac_mdio_reset(struct mii_bus *bus)
+{
+       ar7_device_reset(AR7_RESET_BIT_MDIO);
+       cpmac_write(bus->priv, CPMAC_MDIO_CONTROL, MDIOC_ENABLE |
+                   MDIOC_CLKDIV(ar7_cpmac_freq() / 2200000 - 1));
+       return 0;
+}
+
+static int mii_irqs[PHY_MAX_ADDR] = { PHY_POLL, };
+
+static struct mii_bus cpmac_mii = {
+       .name = "cpmac-mii",
+       .read = cpmac_mdio_read,
+       .write = cpmac_mdio_write,
+       .reset = cpmac_mdio_reset,
+       .irq = mii_irqs,
+};
+
+static int cpmac_config(struct net_device *dev, struct ifmap *map)
+{
+       if (dev->flags & IFF_UP)
+               return -EBUSY;
+
+       /* Don't allow changing the I/O address */
+       if (map->base_addr != dev->base_addr)
+               return -EOPNOTSUPP;
+
+       /* ignore other fields */
+       return 0;
+}
+
+static void cpmac_set_multicast_list(struct net_device *dev)
+{
+       struct dev_mc_list *iter;
+       int i;
+       u8 tmp;
+       u32 mbp, bit, hash[2] = { 0, };
+       struct cpmac_priv *priv = netdev_priv(dev);
+
+       mbp = cpmac_read(priv->regs, CPMAC_MBP);
+       if (dev->flags & IFF_PROMISC) {
+               cpmac_write(priv->regs, CPMAC_MBP, (mbp & ~MBP_PROMISCCHAN(0)) |
+                           MBP_RXPROMISC);
+       } else {
+               cpmac_write(priv->regs, CPMAC_MBP, mbp & ~MBP_RXPROMISC);
+               if (dev->flags & IFF_ALLMULTI) {
+                       /* enable all multicast mode */
+                       cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, 0xffffffff);
+                       cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, 0xffffffff);
+               } else {
+                       /*
+                        * cpmac uses some strange mac address hashing
+                        * (not crc32)
+                        */
+                       for (i = 0, iter = dev->mc_list; i < dev->mc_count;
+                            i++, iter = iter->next) {
+                               bit = 0;
+                               tmp = iter->dmi_addr[0];
+                               bit  ^= (tmp >> 2) ^ (tmp << 4);
+                               tmp = iter->dmi_addr[1];
+                               bit  ^= (tmp >> 4) ^ (tmp << 2);
+                               tmp = iter->dmi_addr[2];
+                               bit  ^= (tmp >> 6) ^ tmp;
+                               tmp = iter->dmi_addr[3];
+                               bit  ^= (tmp >> 2) ^ (tmp << 4);
+                               tmp = iter->dmi_addr[4];
+                               bit  ^= (tmp >> 4) ^ (tmp << 2);
+                               tmp = iter->dmi_addr[5];
+                               bit  ^= (tmp >> 6) ^ tmp;
+                               bit &= 0x3f;
+                               hash[bit / 32] |= 1 << (bit % 32);
+                       }
+
+                       cpmac_write(priv->regs, CPMAC_MAC_HASH_LO, hash[0]);
+                       cpmac_write(priv->regs, CPMAC_MAC_HASH_HI, hash[1]);
+               }
+       }
+}
+
+static struct sk_buff *cpmac_rx_one(struct net_device *dev,
+                                   struct cpmac_priv *priv,
+                                   struct cpmac_desc *desc)
+{
+       struct sk_buff *skb, *result = NULL;
+
+       if (unlikely(netif_msg_hw(priv)))
+               cpmac_dump_desc(dev, desc);
+       cpmac_write(priv->regs, CPMAC_RX_ACK(0), (u32)desc->mapping);
+       if (unlikely(!desc->datalen)) {
+               if (netif_msg_rx_err(priv) && net_ratelimit())
+                       printk(KERN_WARNING "%s: rx: spurious interrupt\n",
+                              dev->name);
+               return NULL;
+       }
+
+       skb = netdev_alloc_skb(dev, CPMAC_SKB_SIZE);
+       if (likely(skb)) {
+               skb_reserve(skb, 2);
+               skb_put(desc->skb, desc->datalen);
+               desc->skb->protocol = eth_type_trans(desc->skb, dev);
+               desc->skb->ip_summed = CHECKSUM_NONE;
+               dev->stats.rx_packets++;
+               dev->stats.rx_bytes += desc->datalen;
+               result = desc->skb;
+               dma_unmap_single(&dev->dev, desc->data_mapping, CPMAC_SKB_SIZE,
+                                DMA_FROM_DEVICE);
+               desc->skb = skb;
+               desc->data_mapping = dma_map_single(&dev->dev, skb->data,
+                                                   CPMAC_SKB_SIZE,
+                                                   DMA_FROM_DEVICE);
+               desc->hw_data = (u32)desc->data_mapping;
+               if (unlikely(netif_msg_pktdata(priv))) {
+                       printk(KERN_DEBUG "%s: received packet:\n", dev->name);
+                       cpmac_dump_skb(dev, result);
+               }
+       } else {
+               if (netif_msg_rx_err(priv) && net_ratelimit())
+                       printk(KERN_WARNING
+                              "%s: low on skbs, dropping packet\n", dev->name);
+               dev->stats.rx_dropped++;
+       }
+
+       desc->buflen = CPMAC_SKB_SIZE;
+       desc->dataflags = CPMAC_OWN;
+
+       return result;
+}
+
+static int cpmac_poll(struct net_device *dev, int *budget)
+{
+       struct sk_buff *skb;
+       struct cpmac_desc *desc;
+       int received = 0, quota = min(dev->quota, *budget);
+       struct cpmac_priv *priv = netdev_priv(dev);
+
+       spin_lock(&priv->rx_lock);
+       if (unlikely(!priv->rx_head)) {
+               if (netif_msg_rx_err(priv) && net_ratelimit())
+                       printk(KERN_WARNING "%s: rx: polling, but no queue\n",
+                              dev->name);
+               netif_rx_complete(dev);
+               return 0;
+       }
+
+       desc = priv->rx_head;
+       while ((received < quota) && ((desc->dataflags & CPMAC_OWN) == 0)) {
+               skb = cpmac_rx_one(dev, priv, desc);
+               if (likely(skb)) {
+                       netif_receive_skb(skb);
+                       received++;
+               }
+               desc = desc->next;
+       }
+
+       priv->rx_head = desc;
+       spin_unlock(&priv->rx_lock);
+       *budget -= received;
+       dev->quota -= received;
+       if (unlikely(netif_msg_rx_status(priv)))
+               printk(KERN_DEBUG "%s: poll processed %d packets\n", dev->name,
+                      received);
+       if (desc->dataflags & CPMAC_OWN) {
+               netif_rx_complete(dev);
+               cpmac_write(priv->regs, CPMAC_RX_PTR(0), (u32)desc->mapping);
+               cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
+               return 0;
+       }
+
+       return 1;
+}
+
+static int cpmac_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+       int queue, len;
+       struct cpmac_desc *desc;
+       struct cpmac_priv *priv = netdev_priv(dev);
+
+       if (unlikely(skb_padto(skb, ETH_ZLEN))) {
+               if (netif_msg_tx_err(priv) && net_ratelimit())
+                       printk(KERN_WARNING
+                              "%s: tx: padding failed, dropping\n", dev->name);
+               spin_lock(&priv->lock);
+               dev->stats.tx_dropped++;
+               spin_unlock(&priv->lock);
+               return -ENOMEM;
+       }
+
+       len = max(skb->len, ETH_ZLEN);
+       queue = skb->queue_mapping;
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
+       netif_stop_subqueue(dev, queue);
+#else
+       netif_stop_queue(dev);
+#endif
+
+       desc = &priv->desc_ring[queue];
+       if (unlikely(desc->dataflags & CPMAC_OWN)) {
+               if (netif_msg_tx_err(priv) && net_ratelimit())
+                       printk(KERN_WARNING "%s: tx dma ring full, dropping\n",
+                              dev->name);
+               spin_lock(&priv->lock);
+               dev->stats.tx_dropped++;
+               spin_unlock(&priv->lock);
+               dev_kfree_skb_any(skb);
+               return -ENOMEM;
+       }
+
+       spin_lock(&priv->lock);
+       dev->trans_start = jiffies;
+       spin_unlock(&priv->lock);
+       desc->dataflags = CPMAC_SOP | CPMAC_EOP | CPMAC_OWN;
+       desc->skb = skb;
+       desc->data_mapping = dma_map_single(&dev->dev, skb->data, len,
+                                           DMA_TO_DEVICE);
+       desc->hw_data = (u32)desc->data_mapping;
+       desc->datalen = len;
+       desc->buflen = len;
+       if (unlikely(netif_msg_tx_queued(priv)))
+               printk(KERN_DEBUG "%s: sending 0x%p, len=%d\n", dev->name, skb,
+                      skb->len);
+       if (unlikely(netif_msg_hw(priv)))
+               cpmac_dump_desc(dev, desc);
+       if (unlikely(netif_msg_pktdata(priv)))
+               cpmac_dump_skb(dev, skb);
+       cpmac_write(priv->regs, CPMAC_TX_PTR(queue), (u32)desc->mapping);
+
+       return 0;
+}
+
+static void cpmac_end_xmit(struct net_device *dev, int queue)
+{
+       struct cpmac_desc *desc;
+       struct cpmac_priv *priv = netdev_priv(dev);
+
+       desc = &priv->desc_ring[queue];
+       cpmac_write(priv->regs, CPMAC_TX_ACK(queue), (u32)desc->mapping);
+       if (likely(desc->skb)) {
+               spin_lock(&priv->lock);
+               dev->stats.tx_packets++;
+               dev->stats.tx_bytes += desc->skb->len;
+               spin_unlock(&priv->lock);
+               dma_unmap_single(&dev->dev, desc->data_mapping, desc->skb->len,
+                                DMA_TO_DEVICE);
+
+               if (unlikely(netif_msg_tx_done(priv)))
+                       printk(KERN_DEBUG "%s: sent 0x%p, len=%d\n", dev->name,
+                              desc->skb, desc->skb->len);
+
+               dev_kfree_skb_irq(desc->skb);
+               desc->skb = NULL;
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
+               if (netif_subqueue_stopped(dev, queue))
+                       netif_wake_subqueue(dev, queue);
+#else
+               if (netif_queue_stopped(dev))
+                       netif_wake_queue(dev);
+#endif
+       } else {
+               if (netif_msg_tx_err(priv) && net_ratelimit())
+                       printk(KERN_WARNING
+                              "%s: end_xmit: spurious interrupt\n", dev->name);
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
+               if (netif_subqueue_stopped(dev, queue))
+                       netif_wake_subqueue(dev, queue);
+#else
+               if (netif_queue_stopped(dev))
+                       netif_wake_queue(dev);
+#endif
+       }
+}
+
+static void cpmac_hw_stop(struct net_device *dev)
+{
+       int i;
+       struct cpmac_priv *priv = netdev_priv(dev);
+       struct plat_cpmac_data *pdata = priv->pdev->dev.platform_data;
+
+       ar7_device_reset(pdata->reset_bit);
+       cpmac_write(priv->regs, CPMAC_RX_CONTROL,
+                   cpmac_read(priv->regs, CPMAC_RX_CONTROL) & ~1);
+       cpmac_write(priv->regs, CPMAC_TX_CONTROL,
+                   cpmac_read(priv->regs, CPMAC_TX_CONTROL) & ~1);
+       for (i = 0; i < 8; i++) {
+               cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
+               cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
+       }
+       cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
+       cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
+       cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
+       cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
+       cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
+                   cpmac_read(priv->regs, CPMAC_MAC_CONTROL) & ~MAC_MII);
+}
+
+static void cpmac_hw_start(struct net_device *dev)
+{
+       int i;
+       struct cpmac_priv *priv = netdev_priv(dev);
+       struct plat_cpmac_data *pdata = priv->pdev->dev.platform_data;
+
+       ar7_device_reset(pdata->reset_bit);
+       for (i = 0; i < 8; i++) {
+               cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
+               cpmac_write(priv->regs, CPMAC_RX_PTR(i), 0);
+       }
+       cpmac_write(priv->regs, CPMAC_RX_PTR(0), priv->rx_head->mapping);
+
+       cpmac_write(priv->regs, CPMAC_MBP, MBP_RXSHORT | MBP_RXBCAST |
+                   MBP_RXMCAST);
+       cpmac_write(priv->regs, CPMAC_BUFFER_OFFSET, 0);
+       for (i = 0; i < 8; i++)
+               cpmac_write(priv->regs, CPMAC_MAC_ADDR_LO(i), dev->dev_addr[5]);
+       cpmac_write(priv->regs, CPMAC_MAC_ADDR_MID, dev->dev_addr[4]);
+       cpmac_write(priv->regs, CPMAC_MAC_ADDR_HI, dev->dev_addr[0] |
+                   (dev->dev_addr[1] << 8) | (dev->dev_addr[2] << 16) |
+                   (dev->dev_addr[3] << 24));
+       cpmac_write(priv->regs, CPMAC_MAX_LENGTH, CPMAC_SKB_SIZE);
+       cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xff);
+       cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 0xff);
+       cpmac_write(priv->regs, CPMAC_TX_INT_CLEAR, 0xff);
+       cpmac_write(priv->regs, CPMAC_MAC_INT_CLEAR, 0xff);
+       cpmac_write(priv->regs, CPMAC_UNICAST_ENABLE, 1);
+       cpmac_write(priv->regs, CPMAC_RX_INT_ENABLE, 1);
+       cpmac_write(priv->regs, CPMAC_TX_INT_ENABLE, 0xff);
+       cpmac_write(priv->regs, CPMAC_MAC_INT_ENABLE, 3);
+
+       cpmac_write(priv->regs, CPMAC_RX_CONTROL,
+                   cpmac_read(priv->regs, CPMAC_RX_CONTROL) | 1);
+       cpmac_write(priv->regs, CPMAC_TX_CONTROL,
+                   cpmac_read(priv->regs, CPMAC_TX_CONTROL) | 1);
+       cpmac_write(priv->regs, CPMAC_MAC_CONTROL,
+                   cpmac_read(priv->regs, CPMAC_MAC_CONTROL) | MAC_MII |
+                   MAC_FDX);
+}
+
+static void cpmac_clear_rx(struct net_device *dev)
+{
+       struct cpmac_priv *priv = netdev_priv(dev);
+       struct cpmac_desc *desc;
+       int i;
+       if (unlikely(!priv->rx_head))
+               return;
+       desc = priv->rx_head;
+       for (i = 0; i < priv->ring_size; i++) {
+               if ((desc->dataflags & CPMAC_OWN) == 0) {
+                       if (netif_msg_rx_err(priv) && net_ratelimit())
+                               printk(KERN_WARNING "%s: packet dropped\n",
+                                      dev->name);
+                       if (unlikely(netif_msg_hw(priv)))
+                               cpmac_dump_desc(dev, desc);
+                       desc->dataflags = CPMAC_OWN;
+                       dev->stats.rx_dropped++;
+               }
+               desc = desc->next;
+       }
+}
+
+static void cpmac_clear_tx(struct net_device *dev)
+{
+       struct cpmac_priv *priv = netdev_priv(dev);
+       int i;
+       if (unlikely(!priv->desc_ring))
+               return;
+       for (i = 0; i < CPMAC_QUEUES; i++)
+               if (priv->desc_ring[i].skb) {
+                       dev_kfree_skb_any(priv->desc_ring[i].skb);
+                       if (netif_subqueue_stopped(dev, i))
+                           netif_wake_subqueue(dev, i);
+               }
+}
+
+static void cpmac_hw_error(struct work_struct *work)
+{
+       struct cpmac_priv *priv =
+               container_of(work, struct cpmac_priv, reset_work);
+
+       spin_lock(&priv->rx_lock);
+       cpmac_clear_rx(priv->dev);
+       spin_unlock(&priv->rx_lock);
+       cpmac_clear_tx(priv->dev);
+       cpmac_hw_start(priv->dev);
+       netif_start_queue(priv->dev);
+}
+
+static irqreturn_t cpmac_irq(int irq, void *dev_id)
+{
+       struct net_device *dev = dev_id;
+       struct cpmac_priv *priv;
+       int queue;
+       u32 status;
+
+       if (!dev)
+               return IRQ_NONE;
+
+       priv = netdev_priv(dev);
+
+       status = cpmac_read(priv->regs, CPMAC_MAC_INT_VECTOR);
+
+       if (unlikely(netif_msg_intr(priv)))
+               printk(KERN_DEBUG "%s: interrupt status: 0x%08x\n", dev->name,
+                      status);
+
+       if (status & MAC_INT_TX)
+               cpmac_end_xmit(dev, (status & 7));
+
+       if (status & MAC_INT_RX) {
+               queue = (status >> 8) & 7;
+               netif_rx_schedule(dev);
+               cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 1 << queue);
+       }
+
+       cpmac_write(priv->regs, CPMAC_MAC_EOI_VECTOR, 0);
+
+       if (unlikely(status & (MAC_INT_HOST | MAC_INT_STATUS))) {
+               if (netif_msg_drv(priv) && net_ratelimit())
+                       printk(KERN_ERR "%s: hw error, resetting...\n",
+                              dev->name);
+               netif_stop_queue(dev);
+               cpmac_hw_stop(dev);
+               schedule_work(&priv->reset_work);
+               if (unlikely(netif_msg_hw(priv)))
+                       cpmac_dump_regs(dev);
+       }
+
+       return IRQ_HANDLED;
+}
+
+static void cpmac_tx_timeout(struct net_device *dev)
+{
+       struct cpmac_priv *priv = netdev_priv(dev);
+       int i;
+
+       spin_lock(&priv->lock);
+       dev->stats.tx_errors++;
+       spin_unlock(&priv->lock);
+       if (netif_msg_tx_err(priv) && net_ratelimit())
+               printk(KERN_WARNING "%s: transmit timeout\n", dev->name);
+       /* 
+        * FIXME: waking up random queue is not the best thing to
+        * do... on the other hand why we got here at all?
+        */
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
+       for (i = 0; i < CPMAC_QUEUES; i++)
+               if (priv->desc_ring[i].skb) {
+                       dev_kfree_skb_any(priv->desc_ring[i].skb);
+                       netif_wake_subqueue(dev, i);
+                       break;
+               }
+#else
+       if (priv->desc_ring[0].skb)
+               dev_kfree_skb_any(priv->desc_ring[0].skb);
+       netif_wake_queue(dev);
+#endif
+}
+
+static int cpmac_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
+{
+       struct cpmac_priv *priv = netdev_priv(dev);
+       if (!(netif_running(dev)))
+               return -EINVAL;
+       if (!priv->phy)
+               return -EINVAL;
+       if ((cmd == SIOCGMIIPHY) || (cmd == SIOCGMIIREG) ||
+           (cmd == SIOCSMIIREG))
+               return phy_mii_ioctl(priv->phy, if_mii(ifr), cmd);
+
+       return -EOPNOTSUPP;
+}
+
+static int cpmac_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+       struct cpmac_priv *priv = netdev_priv(dev);
+
+       if (priv->phy)
+               return phy_ethtool_gset(priv->phy, cmd);
+
+       return -EINVAL;
+}
+
+static int cpmac_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+       struct cpmac_priv *priv = netdev_priv(dev);
+
+       if (!capable(CAP_NET_ADMIN))
+               return -EPERM;
+
+       if (priv->phy)
+               return phy_ethtool_sset(priv->phy, cmd);
+
+       return -EINVAL;
+}
+
+static void cpmac_get_ringparam(struct net_device *dev, struct 
ethtool_ringparam* ring)
+{
+       struct cpmac_priv *priv = netdev_priv(dev);
+
+       ring->rx_max_pending = 1024;
+       ring->rx_mini_max_pending = 1;
+       ring->rx_jumbo_max_pending = 1;
+       ring->tx_max_pending = 1;
+
+       ring->rx_pending = priv->ring_size;
+       ring->rx_mini_pending = 1;
+       ring->rx_jumbo_pending = 1;
+       ring->tx_pending = 1;
+}
+
+static int cpmac_set_ringparam(struct net_device *dev, struct 
ethtool_ringparam* ring)
+{
+       struct cpmac_priv *priv = netdev_priv(dev);
+
+       if (dev->flags && IFF_UP)
+               return -EBUSY;
+       priv->ring_size = ring->rx_pending;
+       return 0;
+}
+
+static void cpmac_get_drvinfo(struct net_device *dev,
+                             struct ethtool_drvinfo *info)
+{
+       strcpy(info->driver, "cpmac");
+       strcpy(info->version, CPMAC_VERSION);
+       info->fw_version[0] = '\0';
+       sprintf(info->bus_info, "%s", "cpmac");
+       info->regdump_len = 0;
+}
+
+static const struct ethtool_ops cpmac_ethtool_ops = {
+       .get_settings = cpmac_get_settings,
+       .set_settings = cpmac_set_settings,
+       .get_drvinfo = cpmac_get_drvinfo,
+       .get_link = ethtool_op_get_link,
+       .get_ringparam = cpmac_get_ringparam,
+       .set_ringparam = cpmac_set_ringparam,
+};
+
+static void cpmac_adjust_link(struct net_device *dev)
+{
+       struct cpmac_priv *priv = netdev_priv(dev);
+       int new_state = 0;
+
+       spin_lock(&priv->lock);
+       if (priv->phy->link) {
+               netif_start_queue(dev);
+               if (priv->phy->duplex != priv->oldduplex) {
+                       new_state = 1;
+                       priv->oldduplex = priv->phy->duplex;
+               }
+
+               if (priv->phy->speed != priv->oldspeed) {
+                       new_state = 1;
+                       priv->oldspeed = priv->phy->speed;
+               }
+
+               if (!priv->oldlink) {
+                       new_state = 1;
+                       priv->oldlink = 1;
+                       netif_schedule(dev);
+               }
+       } else if (priv->oldlink) {
+               netif_stop_queue(dev);
+               new_state = 1;
+               priv->oldlink = 0;
+               priv->oldspeed = 0;
+               priv->oldduplex = -1;
+       }
+
+       if (new_state && netif_msg_link(priv) && net_ratelimit())
+               phy_print_status(priv->phy);
+
+       spin_unlock(&priv->lock);
+}
+
+static int cpmac_open(struct net_device *dev)
+{
+       int i, size, res;
+       struct cpmac_priv *priv = netdev_priv(dev);
+       struct resource *mem;
+       struct cpmac_desc *desc;
+       struct sk_buff *skb;
+
+       priv->phy = phy_connect(dev, priv->phy_name, &cpmac_adjust_link,
+                               0, PHY_INTERFACE_MODE_MII);
+       if (IS_ERR(priv->phy)) {
+               if (netif_msg_drv(priv))
+                       printk(KERN_ERR "%s: Could not attach to PHY\n",
+                              dev->name);
+               return PTR_ERR(priv->phy);
+       }
+
+       mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
+       if (!request_mem_region(mem->start, mem->end - mem->start, dev->name)) {
+               if (netif_msg_drv(priv))
+                       printk(KERN_ERR "%s: failed to request registers\n",
+                              dev->name);
+               res = -ENXIO;
+               goto fail_reserve;
+       }
+
+       priv->regs = ioremap(mem->start, mem->end - mem->start);
+       if (!priv->regs) {
+               if (netif_msg_drv(priv))
+                       printk(KERN_ERR "%s: failed to remap registers\n",
+                              dev->name);
+               res = -ENXIO;
+               goto fail_remap;
+       }
+
+       size = priv->ring_size + CPMAC_QUEUES;
+       priv->desc_ring = dma_alloc_coherent(&dev->dev,
+                                            sizeof(struct cpmac_desc) * size,
+                                            &priv->dma_ring,
+                                            GFP_KERNEL);
+       if (!priv->desc_ring) {
+               res = -ENOMEM;
+               goto fail_alloc;
+       }
+
+       for (i = 0; i < size; i++)
+               priv->desc_ring[i].mapping = priv->dma_ring + sizeof(*desc) * i;
+
+       priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
+       for (i = 0, desc = priv->rx_head; i < priv->ring_size; i++, desc++) {
+               skb = netdev_alloc_skb(dev, CPMAC_SKB_SIZE);
+               if (unlikely(!skb)) {
+                       res = -ENOMEM;
+                       goto fail_desc;
+               }
+               skb_reserve(skb, 2);
+               desc->skb = skb;
+               desc->data_mapping = dma_map_single(&dev->dev, skb->data,
+                                                   CPMAC_SKB_SIZE,
+                                                   DMA_FROM_DEVICE);
+               desc->hw_data = (u32)desc->data_mapping;
+               desc->buflen = CPMAC_SKB_SIZE;
+               desc->dataflags = CPMAC_OWN;
+               desc->next = &priv->rx_head[(i + 1) % priv->ring_size];
+               desc->hw_next = (u32)desc->next->mapping;
+       }
+
+       if ((res = request_irq(dev->irq, cpmac_irq, IRQF_SHARED,
+                              dev->name, dev))) {
+               if (netif_msg_drv(priv))
+                       printk(KERN_ERR "%s: failed to obtain irq\n",
+                              dev->name);
+               goto fail_irq;
+       }
+
+       INIT_WORK(&priv->reset_work, cpmac_hw_error);
+       cpmac_hw_start(dev);
+
+       priv->phy->state = PHY_CHANGELINK;
+       phy_start(priv->phy);
+
+       return 0;
+
+fail_irq:
+fail_desc:
+       for (i = 0; i < priv->ring_size; i++) {
+               if (priv->rx_head[i].skb) {
+                       dma_unmap_single(&dev->dev,
+                                        priv->rx_head[i].data_mapping,
+                                        CPMAC_SKB_SIZE,
+                                        DMA_FROM_DEVICE);
+                       kfree_skb(priv->rx_head[i].skb);
+               }
+       }
+fail_alloc:
+       kfree(priv->desc_ring);
+       iounmap(priv->regs);
+
+fail_remap:
+       release_mem_region(mem->start, mem->end - mem->start);
+
+fail_reserve:
+       phy_disconnect(priv->phy);
+
+       return res;
+}
+
+static int cpmac_stop(struct net_device *dev)
+{
+       int i;
+       struct cpmac_priv *priv = netdev_priv(dev);
+       struct resource *mem;
+
+       netif_stop_queue(dev);
+
+       cancel_work_sync(&priv->reset_work);
+       phy_stop(priv->phy);
+       phy_disconnect(priv->phy);
+       priv->phy = NULL;
+
+       cpmac_hw_stop(dev);
+
+       for (i = 0; i < 8; i++)
+               cpmac_write(priv->regs, CPMAC_TX_PTR(i), 0);
+       cpmac_write(priv->regs, CPMAC_RX_PTR(0), 0);
+       cpmac_write(priv->regs, CPMAC_MBP, 0);
+
+       free_irq(dev->irq, dev);
+       iounmap(priv->regs);
+       mem = platform_get_resource_byname(priv->pdev, IORESOURCE_MEM, "regs");
+       release_mem_region(mem->start, mem->end - mem->start);
+       priv->rx_head = &priv->desc_ring[CPMAC_QUEUES];
+       for (i = 0; i < priv->ring_size; i++) {
+               if (priv->rx_head[i].skb) {
+                       dma_unmap_single(&dev->dev,
+                                        priv->rx_head[i].data_mapping,
+                                        CPMAC_SKB_SIZE,
+                                        DMA_FROM_DEVICE);
+                       kfree_skb(priv->rx_head[i].skb);
+               }
+       }
+
+       dma_free_coherent(&dev->dev, sizeof(struct cpmac_desc) *
+                         (CPMAC_QUEUES + priv->ring_size),
+                         priv->desc_ring, priv->dma_ring);
+       return 0;
+}
+
+static int external_switch;
+
+static int __devinit cpmac_probe(struct platform_device *pdev)
+{
+       int rc, phy_id;
+       struct resource *mem;
+       struct cpmac_priv *priv;
+       struct net_device *dev;
+       struct plat_cpmac_data *pdata;
+
+       pdata = pdev->dev.platform_data;
+
+       for (phy_id = 0; phy_id < PHY_MAX_ADDR; phy_id++) {
+               if (!(pdata->phy_mask & (1 << phy_id)))
+                       continue;
+               if (!cpmac_mii.phy_map[phy_id])
+                       continue;
+               break;
+       }
+
+       if (phy_id == PHY_MAX_ADDR) {
+               if (external_switch || dumb_switch)
+                       phy_id = 0;
+               else {
+                       printk(KERN_ERR "cpmac: no PHY present\n");
+                       return -ENODEV;
+               }
+       }
+
+       dev = alloc_etherdev_mq(sizeof(*priv), CPMAC_QUEUES);
+
+       if (!dev) {
+               printk(KERN_ERR "cpmac: Unable to allocate net_device\n");
+               return -ENOMEM;
+       }
+
+       platform_set_drvdata(pdev, dev);
+       priv = netdev_priv(dev);
+
+       priv->pdev = pdev;
+       mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+       if (!mem) {
+               rc = -ENODEV;
+               goto fail;
+       }
+
+       dev->irq = platform_get_irq_byname(pdev, "irq");
+
+       dev->open               = cpmac_open;
+       dev->stop               = cpmac_stop;
+       dev->set_config         = cpmac_config;
+       dev->hard_start_xmit    = cpmac_start_xmit;
+       dev->do_ioctl           = cpmac_ioctl;
+       dev->set_multicast_list = cpmac_set_multicast_list;
+       dev->tx_timeout         = cpmac_tx_timeout;
+       dev->ethtool_ops        = &cpmac_ethtool_ops;
+       dev->poll = cpmac_poll;
+       dev->weight = 64;
+       dev->features |= NETIF_F_MULTI_QUEUE;
+
+       spin_lock_init(&priv->lock);
+       spin_lock_init(&priv->rx_lock);
+       priv->dev = dev;
+       priv->ring_size = 64;
+       priv->msg_enable = netif_msg_init(debug_level, 0xff);
+       memcpy(dev->dev_addr, pdata->dev_addr, sizeof(dev->dev_addr));
+       if (phy_id == 31) {
+               snprintf(priv->phy_name, BUS_ID_SIZE, PHY_ID_FMT,
+                        cpmac_mii.id, phy_id);
+       } else
+               snprintf(priv->phy_name, BUS_ID_SIZE, "fixed@%d:%d", 100, 1);
+
+       if ((rc = register_netdev(dev))) {
+               printk(KERN_ERR "cpmac: error %i registering device %s\n", rc,
+                      dev->name);
+               goto fail;
+       }
+
+       if (netif_msg_probe(priv)) {
+               printk(KERN_INFO
+                      "cpmac: device %s (regs: %p, irq: %d, phy: %s, mac: "
+                      MAC_FMT ")\n", dev->name, (void *)mem->start, dev->irq,
+                      priv->phy_name, MAC_ARG(dev->dev_addr));
+       }
+       return 0;
+
+fail:
+       free_netdev(dev);
+       return rc;
+}
+
+static int __devexit cpmac_remove(struct platform_device *pdev)
+{
+       struct net_device *dev = platform_get_drvdata(pdev);
+       unregister_netdev(dev);
+       free_netdev(dev);
+       return 0;
+}
+
+static struct platform_driver cpmac_driver = {
+       .driver.name = "cpmac",
+       .probe = cpmac_probe,
+       .remove = __devexit_p(cpmac_remove),
+};
+
+int __devinit cpmac_init(void)
+{
+       u32 mask;
+       int i, res;
+
+       cpmac_mii.priv = ioremap(AR7_REGS_MDIO, 256);
+
+       if (!cpmac_mii.priv) {
+               printk(KERN_ERR "Can't ioremap mdio registers\n");
+               return -ENXIO;
+       }
+
+#warning FIXME: unhardcode gpio&reset bits
+       ar7_gpio_disable(26);
+       ar7_gpio_disable(27);
+       ar7_device_reset(AR7_RESET_BIT_CPMAC_LO);
+       ar7_device_reset(AR7_RESET_BIT_CPMAC_HI);
+       ar7_device_reset(AR7_RESET_BIT_EPHY);
+
+       cpmac_mii.reset(&cpmac_mii);
+
+       for (i = 0; i < 300000; i++)
+               if ((mask = cpmac_read(cpmac_mii.priv, CPMAC_MDIO_ALIVE)))
+                       break;
+               else
+                       cpu_relax();
+
+       mask &= 0x7fffffff;
+       if (mask & (mask - 1)) {
+               external_switch = 1;
+               mask = 0;
+       }
+
+       cpmac_mii.phy_mask = ~(mask | 0x80000000);
+
+       res = mdiobus_register(&cpmac_mii);
+       if (res)
+               goto fail_mii;
+
+       res = platform_driver_register(&cpmac_driver);
+       if (res)
+               goto fail_cpmac;
+
+       return 0;
+
+fail_cpmac:
+       mdiobus_unregister(&cpmac_mii);
+
+fail_mii:
+       iounmap(cpmac_mii.priv);
+
+       return res;
+}
+
+void __devexit cpmac_exit(void)
+{
+       platform_driver_unregister(&cpmac_driver);
+       mdiobus_unregister(&cpmac_mii);
+       iounmap(cpmac_mii.priv);
+}
+
+module_init(cpmac_init);
+module_exit(cpmac_exit);

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