[PATCH][MIPS][7/7] AR7: ethernet

[Matteo Croce <technoboy85@gmail.com>]

Driver for the cpmac 100M ethernet driver.
Jeff, here is the meat ;)

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

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 6a0863e..28ba0dc 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1822,6 +1822,15 @@ 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 9501d64..b536934 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -157,6 +157,7 @@ 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..50aad94
--- /dev/null
+++ b/drivers/net/cpmac.c
@@ -0,0 +1,1166 @@
+/*
+ * 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");
+MODULE_DESCRIPTION("TI AR7 ethernet driver (CPMAC)");
+MODULE_LICENSE("GPL");
+
+static int rx_ring_size = 64;
+static int disable_napi;
+static int debug_level = 8;
+static int dumb_switch;
+
+module_param(rx_ring_size, int, 0644);
+module_param(disable_napi, int, 0644);
+/* 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(rx_ring_size, "Size of rx ring (in skbs)");
+MODULE_PARM_DESC(disable_napi, "Disable NAPI polling");
+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");
+
+/* frame size + 802.1q tag */
+#define CPMAC_SKB_SIZE		(ETH_FRAME_LEN + 4)
+#define CPMAC_TX_RING_SIZE	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 {
+	struct net_device_stats stats;
+	spinlock_t lock;
+	struct cpmac_desc *rx_head;
+	int tx_head, tx_tail;
+	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];
+	struct plat_cpmac_data *config;
+	int oldlink, oldspeed, oldduplex;
+	u32 msg_enable;
+	struct net_device *dev;
+	struct work_struct alloc_work;
+};
+
+static irqreturn_t cpmac_irq(int, void *);
+static void cpmac_reset(struct net_device *dev);
+static void cpmac_hw_init(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 int cpmac_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct sockaddr *sa = addr;
+
+	if (dev->flags & IFF_UP)
+		return -EBUSY;
+
+	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+
+	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)
+{
+	unsigned long flags;
+	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);
+	spin_lock_irqsave(&priv->lock, flags);
+	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;
+		priv->stats.rx_packets++;
+		priv->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);
+		priv->stats.rx_dropped++;
+	}
+	spin_unlock_irqrestore(&priv->lock, flags);
+
+	desc->buflen = CPMAC_SKB_SIZE;
+	desc->dataflags = CPMAC_OWN;
+
+	return result;
+}
+
+static void cpmac_rx(struct net_device *dev)
+{
+	struct sk_buff *skb;
+	struct cpmac_desc *desc;
+	struct cpmac_priv *priv = netdev_priv(dev);
+
+	spin_lock(&priv->lock);
+	if (unlikely(!priv->rx_head)) {
+		spin_unlock(&priv->lock);
+		return;
+	}
+
+	desc = priv->rx_head;
+
+	while ((desc->dataflags & CPMAC_OWN) == 0) {
+		skb = cpmac_rx_one(dev, priv, desc);
+		if (likely(skb))
+			netif_rx(skb);
+		desc = desc->next;
+	}
+
+	priv->rx_head = desc;
+	cpmac_write(priv->regs, CPMAC_RX_PTR(0), (u32)desc->mapping);
+	spin_unlock(&priv->lock);
+}
+
+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);
+
+	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;
+	*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)
+{
+	unsigned long flags;
+	int channel, 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_irqsave(&priv->lock, flags);
+		priv->stats.tx_dropped++;
+		spin_unlock_irqrestore(&priv->lock, flags);
+		return -ENOMEM;
+	}
+
+	len = max(skb->len, ETH_ZLEN);
+	spin_lock_irqsave(&priv->lock, flags);
+	channel = priv->tx_tail++;
+	priv->tx_tail %= CPMAC_TX_RING_SIZE;
+	if (priv->tx_tail == priv->tx_head)
+		netif_stop_queue(dev);
+
+	desc = &priv->desc_ring[channel];
+	if (desc->dataflags & CPMAC_OWN) {
+		if (netif_msg_tx_err(priv) && net_ratelimit())
+			printk(KERN_WARNING "%s: tx dma ring full, dropping\n",
+			       dev->name);
+		priv->stats.tx_dropped++;
+		spin_unlock_irqrestore(&priv->lock, flags);
+		dev_kfree_skb_any(skb);
+		return -ENOMEM;
+	}
+
+	dev->trans_start = jiffies;
+	spin_unlock_irqrestore(&priv->lock, flags);
+	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(channel), (u32)desc->mapping);
+
+	return 0;
+}
+
+static void cpmac_end_xmit(struct net_device *dev, int channel)
+{
+	struct cpmac_desc *desc;
+	struct cpmac_priv *priv = netdev_priv(dev);
+
+	spin_lock(&priv->lock);
+	desc = &priv->desc_ring[channel];
+	cpmac_write(priv->regs, CPMAC_TX_ACK(channel), (u32)desc->mapping);
+	if (likely(desc->skb)) {
+		priv->stats.tx_packets++;
+		priv->stats.tx_bytes += desc->skb->len;
+		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);
+		if (netif_queue_stopped(dev))
+			netif_wake_queue(dev);
+	} else
+		if (netif_msg_tx_err(priv) && net_ratelimit())
+			printk(KERN_WARNING
+			       "%s: end_xmit: spurious interrupt\n", dev->name);
+	spin_unlock(&priv->lock);
+}
+
+static void cpmac_reset(struct net_device *dev)
+{
+	int i;
+	struct cpmac_priv *priv = netdev_priv(dev);
+
+	ar7_device_reset(priv->config->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_MAC_CONTROL,
+		    cpmac_read(priv->regs, CPMAC_MAC_CONTROL) & ~MAC_MII);
+}
+
+static inline void cpmac_free_rx_ring(struct net_device *dev)
+{
+	struct cpmac_desc *desc;
+	int i;
+	struct cpmac_priv *priv = netdev_priv(dev);
+
+	if (unlikely(!priv->rx_head))
+		return;
+
+	desc = priv->rx_head;
+
+	for (i = 0; i < rx_ring_size; i++) {
+		desc->buflen = CPMAC_SKB_SIZE;
+		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;
+			priv->stats.rx_dropped++;
+		}
+		desc = desc->next;
+	}
+}
+
+static irqreturn_t cpmac_irq(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct cpmac_priv *priv;
+	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) {
+		if (disable_napi)
+			cpmac_rx(dev);
+		else {
+			cpmac_write(priv->regs, CPMAC_RX_INT_CLEAR, 1);
+			netif_rx_schedule(dev);
+		}
+	}
+
+	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);
+		if (unlikely(netif_msg_hw(priv)))
+			cpmac_dump_regs(dev);
+		spin_lock(&priv->lock);
+		phy_stop(priv->phy);
+		cpmac_reset(dev);
+		cpmac_free_rx_ring(dev);
+		cpmac_hw_init(dev);
+		spin_unlock(&priv->lock);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static void cpmac_tx_timeout(struct net_device *dev)
+{
+	struct cpmac_priv *priv = netdev_priv(dev);
+	struct cpmac_desc *desc;
+
+	priv->stats.tx_errors++;
+	desc = &priv->desc_ring[priv->tx_head++];
+	priv->tx_head %= 8;
+	if (netif_msg_tx_err(priv) && net_ratelimit())
+		printk(KERN_WARNING "%s: transmit timeout\n", dev->name);
+	if (desc->skb)
+		dev_kfree_skb_any(desc->skb);
+	netif_wake_queue(dev);
+}
+
+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 -EINVAL;
+}
+
+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_drvinfo(struct net_device *dev,
+			      struct ethtool_drvinfo *info)
+{
+	strcpy(info->driver, "cpmac");
+	strcpy(info->version, "0.0.3");
+	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,
+};
+
+static struct net_device_stats *cpmac_stats(struct net_device *dev)
+{
+	struct cpmac_priv *priv = netdev_priv(dev);
+
+	if (netif_device_present(dev))
+		return &priv->stats;
+
+	return NULL;
+}
+
+static int cpmac_change_mtu(struct net_device *dev, int mtu)
+{
+	unsigned long flags;
+	struct cpmac_priv *priv = netdev_priv(dev);
+	spinlock_t *lock = &priv->lock;
+
+	if ((mtu < 68) || (mtu > 1500))
+		return -EINVAL;
+
+	spin_lock_irqsave(lock, flags);
+	dev->mtu = mtu;
+	spin_unlock_irqrestore(lock, flags);
+
+	return 0;
+}
+
+static void cpmac_adjust_link(struct net_device *dev)
+{
+	struct cpmac_priv *priv = netdev_priv(dev);
+	unsigned long flags;
+	int new_state = 0;
+
+	spin_lock_irqsave(&priv->lock, flags);
+	if (priv->phy->link) {
+		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) {
+		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_irqrestore(&priv->lock, flags);
+}
+
+static void cpmac_hw_init(struct net_device *dev)
+{
+	int i;
+	struct cpmac_priv *priv = netdev_priv(dev);
+
+	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_UNICAST_ENABLE, 1);
+	cpmac_write(priv->regs, CPMAC_UNICAST_CLEAR, 0xfe);
+	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_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_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);
+
+	priv->phy->state = PHY_CHANGELINK;
+	phy_start(priv->phy);
+}
+
+static int cpmac_open(struct net_device *dev)
+{
+	int i, size, res;
+	struct cpmac_priv *priv = netdev_priv(dev);
+	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);
+	}
+
+	if (!request_mem_region(dev->mem_start, dev->mem_end -
+				dev->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(dev->mem_start, dev->mem_end -
+			     dev->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;
+	}
+
+	priv->rx_head = NULL;
+	size = rx_ring_size + CPMAC_TX_RING_SIZE;
+	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;
+	}
+
+	priv->rx_head = &priv->desc_ring[CPMAC_TX_RING_SIZE];
+	for (i = 0; i < size; i++)
+		priv->desc_ring[i].mapping = priv->dma_ring + sizeof(*desc) * i;
+
+	for (i = 0, desc = &priv->rx_head[i]; i < rx_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) % rx_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;
+	}
+
+	cpmac_reset(dev);
+	cpmac_hw_init(dev);
+
+	netif_start_queue(dev);
+	return 0;
+
+fail_irq:
+fail_desc:
+	for (i = 0; i < rx_ring_size; i++) {
+		if (priv->rx_head[i].skb) {
+			kfree_skb(priv->rx_head[i].skb);
+			dma_unmap_single(&dev->dev,
+					 priv->rx_head[i].data_mapping,
+					 CPMAC_SKB_SIZE,
+					 DMA_FROM_DEVICE);
+		}
+	}
+fail_alloc:
+	kfree(priv->desc_ring);
+	iounmap(priv->regs);
+
+fail_remap:
+	release_mem_region(dev->mem_start, dev->mem_end -
+			   dev->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);
+
+	netif_stop_queue(dev);
+
+	phy_stop(priv->phy);
+	phy_disconnect(priv->phy);
+	priv->phy = NULL;
+
+	cpmac_reset(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);
+	release_mem_region(dev->mem_start, dev->mem_end -
+			   dev->mem_start);
+	priv->rx_head = &priv->desc_ring[CPMAC_TX_RING_SIZE];
+	for (i = 0; i < rx_ring_size; i++) {
+		if (priv->rx_head[i].skb) {
+			kfree_skb(priv->rx_head[i].skb);
+			dma_unmap_single(&dev->dev,
+					 priv->rx_head[i].data_mapping,
+					 CPMAC_SKB_SIZE,
+					 DMA_FROM_DEVICE);
+		}
+	}
+
+	dma_free_coherent(&dev->dev, sizeof(struct cpmac_desc) *
+			  (CPMAC_TX_RING_SIZE + rx_ring_size),
+			  priv->desc_ring, priv->dma_ring);
+	return 0;
+}
+
+static int external_switch;
+
+static int __devinit cpmac_probe(struct platform_device *pdev)
+{
+	int i, rc, phy_id;
+	struct resource *res;
+	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(sizeof(struct cpmac_priv));
+
+	if (!dev) {
+		printk(KERN_ERR "cpmac: Unable to allocate net_device\n");
+		return -ENOMEM;
+	}
+
+	SET_MODULE_OWNER(dev);
+	platform_set_drvdata(pdev, dev);
+	priv = netdev_priv(dev);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
+	if (!res) {
+		rc = -ENODEV;
+		goto fail;
+	}
+
+	dev->mem_start = res->start;
+	dev->mem_end = res->end;
+	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->get_stats          = cpmac_stats;
+	dev->change_mtu         = cpmac_change_mtu;
+	dev->set_mac_address    = cpmac_set_mac_address;
+	dev->set_multicast_list = cpmac_set_multicast_list;
+	dev->tx_timeout         = cpmac_tx_timeout;
+	dev->ethtool_ops        = &cpmac_ethtool_ops;
+	if (!disable_napi) {
+		dev->poll = cpmac_poll;
+		dev->weight = min(rx_ring_size, 64);
+	}
+
+	spin_lock_init(&priv->lock);
+	priv->msg_enable = netif_msg_init(debug_level, 0xff);
+	priv->config = pdata;
+	priv->dev = dev;
+	memcpy(dev->dev_addr, priv->config->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);
+/*		cpmac_write(cpmac_mii.priv, CPMAC_MDIO_PHYSEL(0), PHYSEL_LINKSEL
+		| PHYSEL_LINKINT | 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: ",
+		       dev->name, (u32 *)dev->mem_start, dev->irq,
+		       priv->phy_name);
+		for (i = 0; i < 6; i++)
+			printk("%02x%s", dev->dev_addr[i], i < 5 ? ":" : ")\n");
+	}
+	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 = 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);