X-Git-Url: http://git.rohieb.name/openwrt.git/blobdiff_plain/b33e4d9b561f07d9925a202c10bccc519ff86d8f..9a41a375f8f55a0f83ca2fc7fd244acde43c3e63:/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c

diff --git a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
index 6b10791cc..97a677ce6 100644
--- a/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
+++ b/target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_main.c
@@ -1,7 +1,7 @@
 /*
  *  Atheros AR71xx built-in ethernet mac driver
  *
- *  Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
+ *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
  *
  *  Based on Atheros' AG7100 driver
@@ -11,6 +11,7 @@
  *  by the Free Software Foundation.
  */
 
+#include <linux/cache.h>
 #include "ag71xx.h"
 
 #define AG71XX_DEFAULT_MSG_ENABLE	\
@@ -23,10 +24,25 @@
 	| NETIF_MSG_RX_ERR		\
 	| NETIF_MSG_TX_ERR )
 
-static int ag71xx_debug = -1;
+static int ag71xx_msg_level = -1;
 
-module_param(ag71xx_debug, int, 0);
-MODULE_PARM_DESC(ag71xx_debug, "Debug level (-1=defaults,0=none,...,16=all)");
+module_param_named(msg_level, ag71xx_msg_level, int, 0);
+MODULE_PARM_DESC(msg_level, "Message level (-1=defaults,0=none,...,16=all)");
+
+static void ag71xx_dump_dma_regs(struct ag71xx *ag)
+{
+	DBG("%s: dma_tx_ctrl=%08x, dma_tx_desc=%08x, dma_tx_status=%08x\n",
+		ag->dev->name,
+		ag71xx_rr(ag, AG71XX_REG_TX_CTRL),
+		ag71xx_rr(ag, AG71XX_REG_TX_DESC),
+		ag71xx_rr(ag, AG71XX_REG_TX_STATUS));
+
+	DBG("%s: dma_rx_ctrl=%08x, dma_rx_desc=%08x, dma_rx_status=%08x\n",
+		ag->dev->name,
+		ag71xx_rr(ag, AG71XX_REG_RX_CTRL),
+		ag71xx_rr(ag, AG71XX_REG_RX_DESC),
+		ag71xx_rr(ag, AG71XX_REG_RX_STATUS));
+}
 
 static void ag71xx_dump_regs(struct ag71xx *ag)
 {
@@ -47,30 +63,50 @@ static void ag71xx_dump_regs(struct ag71xx *ag)
 		ag71xx_rr(ag, AG71XX_REG_FIFO_CFG0),
 		ag71xx_rr(ag, AG71XX_REG_FIFO_CFG1),
 		ag71xx_rr(ag, AG71XX_REG_FIFO_CFG2));
-	DBG("%s: fifo_cfg3=%08x, fifo_cfg3=%08x, fifo_cfg5=%08x\n",
+	DBG("%s: fifo_cfg3=%08x, fifo_cfg4=%08x, fifo_cfg5=%08x\n",
 		ag->dev->name,
 		ag71xx_rr(ag, AG71XX_REG_FIFO_CFG3),
 		ag71xx_rr(ag, AG71XX_REG_FIFO_CFG4),
 		ag71xx_rr(ag, AG71XX_REG_FIFO_CFG5));
 }
 
+static inline void ag71xx_dump_intr(struct ag71xx *ag, char *label, u32 intr)
+{
+	DBG("%s: %s intr=%08x %s%s%s%s%s%s\n",
+		ag->dev->name, label, intr,
+		(intr & AG71XX_INT_TX_PS) ? "TXPS " : "",
+		(intr & AG71XX_INT_TX_UR) ? "TXUR " : "",
+		(intr & AG71XX_INT_TX_BE) ? "TXBE " : "",
+		(intr & AG71XX_INT_RX_PR) ? "RXPR " : "",
+		(intr & AG71XX_INT_RX_OF) ? "RXOF " : "",
+		(intr & AG71XX_INT_RX_BE) ? "RXBE " : "");
+}
+
 static void ag71xx_ring_free(struct ag71xx_ring *ring)
 {
 	kfree(ring->buf);
 
-	if (ring->descs)
-		dma_free_coherent(NULL, ring->size * sizeof(*ring->descs),
-				  ring->descs, ring->descs_dma);
+	if (ring->descs_cpu)
+		dma_free_coherent(NULL, ring->size * ring->desc_size,
+				  ring->descs_cpu, ring->descs_dma);
 }
 
 static int ag71xx_ring_alloc(struct ag71xx_ring *ring, unsigned int size)
 {
 	int err;
+	int i;
+
+	ring->desc_size = sizeof(struct ag71xx_desc);
+	if (ring->desc_size % cache_line_size()) {
+		DBG("ag71xx: ring %p, desc size %u rounded to %u\n",
+			ring, ring->desc_size,
+			roundup(ring->desc_size, cache_line_size()));
+		ring->desc_size = roundup(ring->desc_size, cache_line_size());
+	}
 
-	ring->descs = dma_alloc_coherent(NULL, size * sizeof(*ring->descs),
-					 &ring->descs_dma,
-					 GFP_ATOMIC);
-	if (!ring->descs) {
+	ring->descs_cpu = dma_alloc_coherent(NULL, size * ring->desc_size,
+					     &ring->descs_dma, GFP_ATOMIC);
+	if (!ring->descs_cpu) {
 		err = -ENOMEM;
 		goto err;
 	}
@@ -83,9 +119,15 @@ static int ag71xx_ring_alloc(struct ag71xx_ring *ring, unsigned int size)
 		goto err;
 	}
 
+	for (i = 0; i < size; i++) {
+		ring->buf[i].desc = (struct ag71xx_desc *)&ring->descs_cpu[i * ring->desc_size];
+		DBG("ag71xx: ring %p, desc %d at %p\n",
+			ring, i, ring->buf[i].desc);
+	}
+
 	return 0;
 
-err:
+ err:
 	return err;
 }
 
@@ -97,8 +139,8 @@ static void ag71xx_ring_tx_clean(struct ag71xx *ag)
 	while (ring->curr != ring->dirty) {
 		u32 i = ring->dirty % AG71XX_TX_RING_SIZE;
 
-		if (!ag71xx_desc_empty(&ring->descs[i])) {
-			ring->descs[i].ctrl = 0;
+		if (!ag71xx_desc_empty(ring->buf[i].desc)) {
+			ring->buf[i].desc->ctrl = 0;
 			dev->stats.tx_errors++;
 		}
 
@@ -121,10 +163,10 @@ static void ag71xx_ring_tx_init(struct ag71xx *ag)
 	int i;
 
 	for (i = 0; i < AG71XX_TX_RING_SIZE; i++) {
-		ring->descs[i].next = (u32) (ring->descs_dma +
-			sizeof(*ring->descs) * ((i + 1) % AG71XX_TX_RING_SIZE));
+		ring->buf[i].desc->next = (u32) (ring->descs_dma +
+			ring->desc_size * ((i + 1) % AG71XX_TX_RING_SIZE));
 
-		ring->descs[i].ctrl = DESC_EMPTY;
+		ring->buf[i].desc->ctrl = DESC_EMPTY;
 		ring->buf[i].skb = NULL;
 	}
 
@@ -156,9 +198,14 @@ static int ag71xx_ring_rx_init(struct ag71xx *ag)
 	int ret;
 
 	ret = 0;
-	for (i = 0; i < AG71XX_RX_RING_SIZE; i++)
-		ring->descs[i].next = (u32) (ring->descs_dma +
-			sizeof(*ring->descs) * ((i + 1) % AG71XX_RX_RING_SIZE));
+	for (i = 0; i < AG71XX_RX_RING_SIZE; i++) {
+		ring->buf[i].desc->next = (u32) (ring->descs_dma +
+			ring->desc_size * ((i + 1) % AG71XX_RX_RING_SIZE));
+
+		DBG("ag71xx: RX desc at %p, next is %08x\n",
+			ring->buf[i].desc,
+			ring->buf[i].desc->next);
+	}
 
 	for (i = 0; i < AG71XX_RX_RING_SIZE; i++) {
 		struct sk_buff *skb;
@@ -169,12 +216,15 @@ static int ag71xx_ring_rx_init(struct ag71xx *ag)
 			break;
 		}
 
+		dma_map_single(NULL, skb->data, AG71XX_RX_PKT_SIZE,
+				DMA_FROM_DEVICE);
+
 		skb->dev = ag->dev;
 		skb_reserve(skb, AG71XX_RX_PKT_RESERVE);
 
 		ring->buf[i].skb = skb;
-		ring->descs[i].data = virt_to_phys(skb->data);
-		ring->descs[i].ctrl = DESC_EMPTY;
+		ring->buf[i].desc->data = virt_to_phys(skb->data);
+		ring->buf[i].desc->ctrl = DESC_EMPTY;
 	}
 
 	/* flush descriptors */
@@ -201,19 +251,20 @@ static int ag71xx_ring_rx_refill(struct ag71xx *ag)
 			struct sk_buff *skb;
 
 			skb = dev_alloc_skb(AG71XX_RX_PKT_SIZE);
-			if (skb == NULL) {
-				printk(KERN_ERR "%s: no memory for skb\n",
-					ag->dev->name);
+			if (skb == NULL)
 				break;
-			}
+
+			dma_map_single(NULL, skb->data, AG71XX_RX_PKT_SIZE,
+					DMA_FROM_DEVICE);
 
 			skb_reserve(skb, AG71XX_RX_PKT_RESERVE);
 			skb->dev = ag->dev;
+
 			ring->buf[i].skb = skb;
-			ring->descs[i].data = virt_to_phys(skb->data);
+			ring->buf[i].desc->data = virt_to_phys(skb->data);
 		}
 
-		ring->descs[i].ctrl = DESC_EMPTY;
+		ring->buf[i].desc->ctrl = DESC_EMPTY;
 		count++;
 	}
 
@@ -257,7 +308,7 @@ static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
 	u32 t;
 
 	t = (((u32) mac[0]) << 24) | (((u32) mac[1]) << 16)
-	  | (((u32) mac[2]) << 8) | ((u32) mac[2]);
+	  | (((u32) mac[2]) << 8) | ((u32) mac[3]);
 
 	ag71xx_wr(ag, AG71XX_REG_MAC_ADDR1, t);
 
@@ -265,8 +316,66 @@ static void ag71xx_hw_set_macaddr(struct ag71xx *ag, unsigned char *mac)
 	ag71xx_wr(ag, AG71XX_REG_MAC_ADDR2, t);
 }
 
-#define MAC_CFG1_INIT	(MAC_CFG1_RXE | MAC_CFG1_TXE | MAC_CFG1_SRX \
-			| MAC_CFG1_STX)
+static void ag71xx_dma_reset(struct ag71xx *ag)
+{
+	u32 val;
+	int i;
+
+	ag71xx_dump_dma_regs(ag);
+
+	/* stop RX and TX */
+	ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
+	ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
+
+	/* clear descriptor addresses */
+	ag71xx_wr(ag, AG71XX_REG_TX_DESC, 0);
+	ag71xx_wr(ag, AG71XX_REG_RX_DESC, 0);
+
+	/* clear pending RX/TX interrupts */
+	for (i = 0; i < 256; i++) {
+		ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
+		ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_PS);
+	}
+
+	/* clear pending errors */
+	ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_BE | RX_STATUS_OF);
+	ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_BE | TX_STATUS_UR);
+
+	val = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
+	if (val)
+		printk(KERN_ALERT "%s: unable to clear DMA Rx status: %08x\n",
+			ag->dev->name, val);
+
+	val = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
+
+	/* mask out reserved bits */
+	val &= ~0xff000000;
+
+	if (val)
+		printk(KERN_ALERT "%s: unable to clear DMA Tx status: %08x\n",
+			ag->dev->name, val);
+
+	ag71xx_dump_dma_regs(ag);
+}
+
+#define MAC_CFG1_INIT	(MAC_CFG1_RXE | MAC_CFG1_TXE | \
+			 MAC_CFG1_SRX | MAC_CFG1_STX)
+
+#define FIFO_CFG0_INIT	(FIFO_CFG0_ALL << FIFO_CFG0_ENABLE_SHIFT)
+
+#define FIFO_CFG4_INIT	(FIFO_CFG4_DE | FIFO_CFG4_DV | FIFO_CFG4_FC | \
+			 FIFO_CFG4_CE | FIFO_CFG4_CR | FIFO_CFG4_LM | \
+			 FIFO_CFG4_LO | FIFO_CFG4_OK | FIFO_CFG4_MC | \
+			 FIFO_CFG4_BC | FIFO_CFG4_DR | FIFO_CFG4_LE | \
+			 FIFO_CFG4_CF | FIFO_CFG4_PF | FIFO_CFG4_UO | \
+			 FIFO_CFG4_VT)
+
+#define FIFO_CFG5_INIT	(FIFO_CFG5_DE | FIFO_CFG5_DV | FIFO_CFG5_FC | \
+			 FIFO_CFG5_CE | FIFO_CFG5_LO | FIFO_CFG5_OK | \
+			 FIFO_CFG5_MC | FIFO_CFG5_BC | FIFO_CFG5_DR | \
+			 FIFO_CFG5_CF | FIFO_CFG5_PF | FIFO_CFG5_VT | \
+			 FIFO_CFG5_LE | FIFO_CFG5_FT | FIFO_CFG5_16 | \
+			 FIFO_CFG5_17 | FIFO_CFG5_SF)
 
 static void ag71xx_hw_init(struct ag71xx *ag)
 {
@@ -280,21 +389,30 @@ static void ag71xx_hw_init(struct ag71xx *ag)
 	ar71xx_device_start(pdata->reset_bit);
 	mdelay(100);
 
+	/* setup MAC configuration registers */
 	ag71xx_wr(ag, AG71XX_REG_MAC_CFG1, MAC_CFG1_INIT);
-
-	/* TODO: set max packet size */
-
 	ag71xx_sb(ag, AG71XX_REG_MAC_CFG2,
 		  MAC_CFG2_PAD_CRC_EN | MAC_CFG2_LEN_CHECK);
 
-	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG0, 0x00001f00);
+	/* setup max frame length */
+	ag71xx_wr(ag, AG71XX_REG_MAC_MFL, AG71XX_TX_MTU_LEN);
 
+	/* setup MII interface type */
 	ag71xx_mii_ctrl_set_if(ag, pdata->mii_if);
 
-	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, 0x0fff0000);
-	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, 0x00001fff);
-	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG4, 0x0000ffff);
-	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, 0x0007ffef);
+	/* setup FIFO configuration registers */
+	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG0, FIFO_CFG0_INIT);
+	if (pdata->is_ar724x) {
+		ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, pdata->fifo_cfg1);
+		ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, pdata->fifo_cfg2);
+	} else {
+		ag71xx_wr(ag, AG71XX_REG_FIFO_CFG1, 0x0fff0000);
+		ag71xx_wr(ag, AG71XX_REG_FIFO_CFG2, 0x00001fff);
+	}
+	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG4, FIFO_CFG4_INIT);
+	ag71xx_wr(ag, AG71XX_REG_FIFO_CFG5, FIFO_CFG5_INIT);
+
+	ag71xx_dma_reset(ag);
 }
 
 static void ag71xx_hw_start(struct ag71xx *ag)
@@ -308,12 +426,10 @@ static void ag71xx_hw_start(struct ag71xx *ag)
 
 static void ag71xx_hw_stop(struct ag71xx *ag)
 {
-	/* stop RX and TX */
-	ag71xx_wr(ag, AG71XX_REG_RX_CTRL, 0);
-	ag71xx_wr(ag, AG71XX_REG_TX_CTRL, 0);
-
 	/* disable all interrupts */
 	ag71xx_wr(ag, AG71XX_REG_INT_ENABLE, 0);
+
+	ag71xx_dma_reset(ag);
 }
 
 static int ag71xx_open(struct net_device *dev)
@@ -341,7 +457,7 @@ static int ag71xx_open(struct net_device *dev)
 
 	return 0;
 
-err:
+ err:
 	ag71xx_rings_cleanup(ag);
 	return ret;
 }
@@ -361,6 +477,7 @@ static int ag71xx_stop(struct net_device *dev)
 	ag71xx_phy_stop(ag);
 
 	napi_disable(&ag->napi);
+	del_timer_sync(&ag->oom_timer);
 
 	spin_unlock_irqrestore(&ag->lock, flags);
 
@@ -372,28 +489,24 @@ static int ag71xx_stop(struct net_device *dev)
 static int ag71xx_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 {
 	struct ag71xx *ag = netdev_priv(dev);
-	struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 	struct ag71xx_ring *ring = &ag->tx_ring;
 	struct ag71xx_desc *desc;
-	unsigned long flags;
 	int i;
 
 	i = ring->curr % AG71XX_TX_RING_SIZE;
-	desc = &ring->descs[i];
-
-	spin_lock_irqsave(&ag->lock, flags);
-	ar71xx_ddr_flush(pdata->flush_reg);
-	spin_unlock_irqrestore(&ag->lock, flags);
+	desc = ring->buf[i].desc;
 
 	if (!ag71xx_desc_empty(desc))
 		goto err_drop;
 
+	ag71xx_add_ar8216_header(ag, skb);
+
 	if (skb->len <= 0) {
 		DBG("%s: packet len is too small\n", ag->dev->name);
 		goto err_drop;
 	}
 
-	dma_cache_wback_inv((unsigned long)skb->data, skb->len);
+	dma_map_single(NULL, skb->data, skb->len, DMA_TO_DEVICE);
 
 	ring->buf[i].skb = skb;
 
@@ -419,7 +532,7 @@ static int ag71xx_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	return 0;
 
-err_drop:
+ err_drop:
 	dev->stats.tx_dropped++;
 
 	dev_kfree_skb(skb);
@@ -469,22 +582,43 @@ static int ag71xx_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	return -EOPNOTSUPP;
 }
 
+static void ag71xx_oom_timer_handler(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *) data;
+	struct ag71xx *ag = netdev_priv(dev);
+
+	napi_schedule(&ag->napi);
+}
+
+static void ag71xx_tx_timeout(struct net_device *dev)
+{
+	struct ag71xx *ag = netdev_priv(dev);
+
+	if (netif_msg_tx_err(ag))
+		printk(KERN_DEBUG "%s: tx timeout\n", ag->dev->name);
+
+	schedule_work(&ag->restart_work);
+}
+
+static void ag71xx_restart_work_func(struct work_struct *work)
+{
+	struct ag71xx *ag = container_of(work, struct ag71xx, restart_work);
+
+	ag71xx_stop(ag->dev);
+	ag71xx_open(ag->dev);
+}
+
 static void ag71xx_tx_packets(struct ag71xx *ag)
 {
-	struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
 	struct ag71xx_ring *ring = &ag->tx_ring;
 	unsigned int sent;
 
 	DBG("%s: processing TX ring\n", ag->dev->name);
 
-#ifdef AG71XX_NAPI_TX
-	ar71xx_ddr_flush(pdata->flush_reg);
-#endif
-
 	sent = 0;
 	while (ring->dirty != ring->curr) {
 		unsigned int i = ring->dirty % AG71XX_TX_RING_SIZE;
-		struct ag71xx_desc *desc = &ring->descs[i];
+		struct ag71xx_desc *desc = ring->buf[i].desc;
 		struct sk_buff *skb = ring->buf[i].skb;
 
 		if (!ag71xx_desc_empty(desc))
@@ -513,24 +647,14 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 {
 	struct net_device *dev = ag->dev;
 	struct ag71xx_ring *ring = &ag->rx_ring;
-#ifndef AG71XX_NAPI_TX
-	struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
-	unsigned long flags;
-#endif
 	int done = 0;
 
-#ifndef AG71XX_NAPI_TX
-	spin_lock_irqsave(&ag->lock, flags);
-	ar71xx_ddr_flush(pdata->flush_reg);
-	spin_unlock_irqrestore(&ag->lock, flags);
-#endif
-
 	DBG("%s: rx packets, limit=%d, curr=%u, dirty=%u\n",
 			dev->name, limit, ring->curr, ring->dirty);
 
 	while (done < limit) {
 		unsigned int i = ring->curr % AG71XX_RX_RING_SIZE;
-		struct ag71xx_desc *desc = &ring->descs[i];
+		struct ag71xx_desc *desc = ring->buf[i].desc;
 		struct sk_buff *skb;
 		int pktlen;
 
@@ -542,32 +666,33 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 			break;
 		}
 
+		ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
+
 		skb = ring->buf[i].skb;
 		pktlen = ag71xx_desc_pktlen(desc);
 		pktlen -= ETH_FCS_LEN;
 
-		/* TODO: move it into the refill function */
-		dma_cache_wback_inv((unsigned long)skb->data, pktlen);
 		skb_put(skb, pktlen);
 
 		skb->dev = dev;
-		skb->protocol = eth_type_trans(skb, dev);
-		skb->ip_summed = CHECKSUM_UNNECESSARY;
-
-		netif_receive_skb(skb);
+		skb->ip_summed = CHECKSUM_NONE;
 
 		dev->last_rx = jiffies;
 		dev->stats.rx_packets++;
 		dev->stats.rx_bytes += pktlen;
 
+		if (ag71xx_remove_ar8216_header(ag, skb) != 0) {
+			dev->stats.rx_dropped++;
+			kfree_skb(skb);
+		} else {
+			skb->protocol = eth_type_trans(skb, dev);
+			netif_receive_skb(skb);
+		}
+
 		ring->buf[i].skb = NULL;
 		done++;
 
-		ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_PR);
-
 		ring->curr++;
-		if ((ring->curr - ring->dirty) > (AG71XX_RX_RING_SIZE / 4))
-			ag71xx_ring_rx_refill(ag);
 	}
 
 	ag71xx_ring_rx_refill(ag);
@@ -581,54 +706,64 @@ static int ag71xx_rx_packets(struct ag71xx *ag, int limit)
 static int ag71xx_poll(struct napi_struct *napi, int limit)
 {
 	struct ag71xx *ag = container_of(napi, struct ag71xx, napi);
-#ifdef AG71XX_NAPI_TX
 	struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
-#endif
 	struct net_device *dev = ag->dev;
+	struct ag71xx_ring *rx_ring;
 	unsigned long flags;
 	u32 status;
 	int done;
 
-#ifdef AG71XX_NAPI_TX
-	ar71xx_ddr_flush(pdata->flush_reg);
+	pdata->ddr_flush();
 	ag71xx_tx_packets(ag);
-#endif
 
 	DBG("%s: processing RX ring\n", dev->name);
 	done = ag71xx_rx_packets(ag, limit);
 
-	/* TODO: add OOM handler */
+	rx_ring = &ag->rx_ring;
+	if (rx_ring->buf[rx_ring->dirty % AG71XX_RX_RING_SIZE].skb == NULL)
+		goto oom;
 
-	status = ag71xx_rr(ag, AG71XX_REG_INT_STATUS);
-	status &= AG71XX_INT_POLL;
+	status = ag71xx_rr(ag, AG71XX_REG_RX_STATUS);
+	if (unlikely(status & RX_STATUS_OF)) {
+		ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_OF);
+		dev->stats.rx_fifo_errors++;
 
-	if ((done < limit) && (!status)) {
-		DBG("%s: disable polling mode, done=%d, status=%x\n",
-			dev->name, done, status);
+		/* restart RX */
+		ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
+	}
 
-		netif_rx_complete(dev, napi);
+	if (done < limit) {
+		if (status & RX_STATUS_PR)
+			goto more;
+
+		status = ag71xx_rr(ag, AG71XX_REG_TX_STATUS);
+		if (status & TX_STATUS_PS)
+			goto more;
+
+		DBG("%s: disable polling mode, done=%d, limit=%d\n",
+			dev->name, done, limit);
+
+		napi_complete(napi);
 
 		/* enable interrupts */
 		spin_lock_irqsave(&ag->lock, flags);
 		ag71xx_int_enable(ag, AG71XX_INT_POLL);
 		spin_unlock_irqrestore(&ag->lock, flags);
-		return 0;
+		return done;
 	}
 
-	if (status & AG71XX_INT_RX_OF) {
-		if (netif_msg_rx_err(ag))
-			printk(KERN_ALERT "%s: rx owerflow, restarting dma\n",
-				dev->name);
+ more:
+	DBG("%s: stay in polling mode, done=%d, limit=%d\n",
+			dev->name, done, limit);
+	return done;
 
-		/* ack interrupt */
-		ag71xx_wr(ag, AG71XX_REG_RX_STATUS, RX_STATUS_OF);
-		/* restart RX */
-		ag71xx_wr(ag, AG71XX_REG_RX_CTRL, RX_CTRL_RXE);
-	}
+ oom:
+	if (netif_msg_rx_err(ag))
+		printk(KERN_DEBUG "%s: out of memory\n", dev->name);
 
-	DBG("%s: stay in polling mode, done=%d, status=%x\n",
-			dev->name, done, status);
-	return 1;
+	mod_timer(&ag->oom_timer, jiffies + AG71XX_OOM_REFILL);
+	napi_complete(napi);
+	return 0;
 }
 
 static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
@@ -638,7 +773,7 @@ static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
 	u32 status;
 
 	status = ag71xx_rr(ag, AG71XX_REG_INT_STATUS);
-	status &= ag71xx_rr(ag, AG71XX_REG_INT_ENABLE);
+	ag71xx_dump_intr(ag, "raw", status);
 
 	if (unlikely(!status))
 		return IRQ_NONE;
@@ -654,24 +789,14 @@ static irqreturn_t ag71xx_interrupt(int irq, void *dev_id)
 		}
 	}
 
-#if 0
-	if (unlikely(status & AG71XX_INT_TX_UR)) {
-		ag71xx_wr(ag, AG71XX_REG_TX_STATUS, TX_STATUS_UR);
-		DBG("%s: TX underrun\n", dev->name);
-	}
-#endif
-
-#ifndef AG71XX_NAPI_TX
-	if (likely(status & AG71XX_INT_TX_PS))
-		ag71xx_tx_packets(ag);
-#endif
-
 	if (likely(status & AG71XX_INT_POLL)) {
 		ag71xx_int_disable(ag, AG71XX_INT_POLL);
 		DBG("%s: enable polling mode\n", dev->name);
-		netif_rx_schedule(dev, &ag->napi);
+		napi_schedule(&ag->napi);
 	}
 
+	ag71xx_debugfs_update_int_stats(ag, status);
+
 	return IRQ_HANDLED;
 }
 
@@ -680,6 +805,18 @@ static void ag71xx_set_multicast_list(struct net_device *dev)
 	/* TODO */
 }
 
+static const struct net_device_ops ag71xx_netdev_ops = {
+	.ndo_open		= ag71xx_open,
+	.ndo_stop		= ag71xx_stop,
+	.ndo_start_xmit		= ag71xx_hard_start_xmit,
+	.ndo_set_multicast_list	= ag71xx_set_multicast_list,
+	.ndo_do_ioctl		= ag71xx_do_ioctl,
+	.ndo_tx_timeout		= ag71xx_tx_timeout,
+	.ndo_change_mtu		= eth_change_mtu,
+	.ndo_set_mac_address	= eth_mac_addr,
+	.ndo_validate_addr	= eth_validate_addr,
+};
+
 static int __init ag71xx_probe(struct platform_device *pdev)
 {
 	struct net_device *dev;
@@ -695,6 +832,12 @@ static int __init ag71xx_probe(struct platform_device *pdev)
 		goto err_out;
 	}
 
+	if (pdata->mii_bus_dev == NULL) {
+		dev_err(&pdev->dev, "no MII bus device specified\n");
+		err = -EINVAL;
+		goto err_out;
+	}
+
 	dev = alloc_etherdev(sizeof(*ag));
 	if (!dev) {
 		dev_err(&pdev->dev, "alloc_etherdev failed\n");
@@ -707,8 +850,7 @@ static int __init ag71xx_probe(struct platform_device *pdev)
 	ag = netdev_priv(dev);
 	ag->pdev = pdev;
 	ag->dev = dev;
-	ag->mii_bus = &ag71xx_mdio_bus->mii_bus;
-	ag->msg_enable = netif_msg_init(ag71xx_debug,
+	ag->msg_enable = netif_msg_init(ag71xx_msg_level,
 					AG71XX_DEFAULT_MSG_ENABLE);
 	spin_lock_init(&ag->lock);
 
@@ -726,32 +868,18 @@ static int __init ag71xx_probe(struct platform_device *pdev)
 		goto err_free_dev;
 	}
 
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mac_base2");
-	if (!res) {
-		dev_err(&pdev->dev, "no mac_base2 resource found\n");
-		err = -ENXIO;
-		goto err_unmap_base1;
-	}
-
-	ag->mac_base2 = ioremap_nocache(res->start, res->end - res->start + 1);
-	if (!ag->mac_base) {
-		dev_err(&pdev->dev, "unable to ioremap mac_base2\n");
-		err = -ENOMEM;
-		goto err_unmap_base1;
-	}
-
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mii_ctrl");
 	if (!res) {
 		dev_err(&pdev->dev, "no mii_ctrl resource found\n");
 		err = -ENXIO;
-		goto err_unmap_base2;
+		goto err_unmap_base;
 	}
 
 	ag->mii_ctrl = ioremap_nocache(res->start, res->end - res->start + 1);
 	if (!ag->mii_ctrl) {
 		dev_err(&pdev->dev, "unable to ioremap mii_ctrl\n");
 		err = -ENOMEM;
-		goto err_unmap_base2;
+		goto err_unmap_base;
 	}
 
 	dev->irq = platform_get_irq(pdev, 0);
@@ -764,23 +892,18 @@ static int __init ag71xx_probe(struct platform_device *pdev)
 	}
 
 	dev->base_addr = (unsigned long)ag->mac_base;
-	dev->open = ag71xx_open;
-	dev->stop = ag71xx_stop;
-	dev->hard_start_xmit = ag71xx_hard_start_xmit;
-	dev->set_multicast_list = ag71xx_set_multicast_list;
-	dev->do_ioctl = ag71xx_do_ioctl;
+	dev->netdev_ops = &ag71xx_netdev_ops;
 	dev->ethtool_ops = &ag71xx_ethtool_ops;
 
-	netif_napi_add(dev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT);
+	INIT_WORK(&ag->restart_work, ag71xx_restart_work_func);
 
-	if (is_valid_ether_addr(pdata->mac_addr))
-		memcpy(dev->dev_addr, pdata->mac_addr, ETH_ALEN);
-	else {
-		dev->dev_addr[0] = 0xde;
-		dev->dev_addr[1] = 0xad;
-		get_random_bytes(&dev->dev_addr[2], 3);
-		dev->dev_addr[5] = pdev->id & 0xff;
-	}
+	init_timer(&ag->oom_timer);
+	ag->oom_timer.data = (unsigned long) dev;
+	ag->oom_timer.function = ag71xx_oom_timer_handler;
+
+	memcpy(dev->dev_addr, pdata->mac_addr, ETH_ALEN);
+
+	netif_napi_add(dev, &ag->napi, ag71xx_poll, AG71XX_NAPI_WEIGHT);
 
 	err = register_netdev(dev);
 	if (err) {
@@ -797,34 +920,31 @@ static int __init ag71xx_probe(struct platform_device *pdev)
 
 	ag71xx_dump_regs(ag);
 
-	/* Reset the mdio bus explicitly */
-	if (ag->mii_bus) {
-		mutex_lock(&ag->mii_bus->mdio_lock);
-		ag->mii_bus->reset(ag->mii_bus);
-		mutex_unlock(&ag->mii_bus->mdio_lock);
-	}
-
 	err = ag71xx_phy_connect(ag);
 	if (err)
 		goto err_unregister_netdev;
 
+	err = ag71xx_debugfs_init(ag);
+	if (err)
+		goto err_phy_disconnect;
+
 	platform_set_drvdata(pdev, dev);
 
 	return 0;
 
-err_unregister_netdev:
+ err_phy_disconnect:
+	ag71xx_phy_disconnect(ag);
+ err_unregister_netdev:
 	unregister_netdev(dev);
-err_free_irq:
+ err_free_irq:
 	free_irq(dev->irq, dev);
-err_unmap_mii_ctrl:
+ err_unmap_mii_ctrl:
 	iounmap(ag->mii_ctrl);
-err_unmap_base2:
-	iounmap(ag->mac_base2);
-err_unmap_base1:
+ err_unmap_base:
 	iounmap(ag->mac_base);
-err_free_dev:
+ err_free_dev:
 	kfree(dev);
-err_out:
+ err_out:
 	platform_set_drvdata(pdev, NULL);
 	return err;
 }
@@ -836,11 +956,11 @@ static int __exit ag71xx_remove(struct platform_device *pdev)
 	if (dev) {
 		struct ag71xx *ag = netdev_priv(dev);
 
+		ag71xx_debugfs_exit(ag);
 		ag71xx_phy_disconnect(ag);
 		unregister_netdev(dev);
 		free_irq(dev->irq, dev);
 		iounmap(ag->mii_ctrl);
-		iounmap(ag->mac_base2);
 		iounmap(ag->mac_base);
 		kfree(dev);
 		platform_set_drvdata(pdev, NULL);
@@ -861,25 +981,33 @@ static int __init ag71xx_module_init(void)
 {
 	int ret;
 
-	ret = ag71xx_mdio_driver_init();
+	ret = ag71xx_debugfs_root_init();
 	if (ret)
 		goto err_out;
 
+	ret = ag71xx_mdio_driver_init();
+	if (ret)
+		goto err_debugfs_exit;
+
 	ret = platform_driver_register(&ag71xx_driver);
 	if (ret)
 		goto err_mdio_exit;
 
 	return 0;
 
-err_mdio_exit:
+ err_mdio_exit:
 	ag71xx_mdio_driver_exit();
-err_out:
+ err_debugfs_exit:
+	ag71xx_debugfs_root_exit();
+ err_out:
 	return ret;
 }
 
 static void __exit ag71xx_module_exit(void)
 {
 	platform_driver_unregister(&ag71xx_driver);
+	ag71xx_mdio_driver_exit();
+	ag71xx_debugfs_root_exit();
 }
 
 module_init(ag71xx_module_init);