linux-kernel - [PATCH 4/4] IP100A: Solve host error problem in low performance embedded system when continune down and up.

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Message-Id: <1156271492.4662.6.camel@localhost.localdomain>
Date:	Tue, 22 Aug 2006 14:31:32 -0400
From:	Jesse Huang <jesse@...lus.com.tw>
To:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	akpm@...l.org, jgarzik@...ox.com, jesse@...lus.com.tw
Subject: [PATCH 4/4] IP100A: Solve host error problem in low performance
	embedded system when continune down and up.

From: Jesse Huang <jesse@...lus.com.tw>

Change Logs:
   - Solve host error problem in low performance embedded 
     system when continune down and up.

Signed-off-by: Jesse Huang <jesse@...lus.com.tw>

---

 sundance.c |   30 +++++++++++++++++++++++++-----
 1 files changed, 25 insertions(+), 5 deletions(-)

a88c635933a981dd4fca87e5b8ca9426c5c98013
diff --git a/sundance.c b/sundance.c
index 424aebd..de55e0f 100755
--- a/sundance.c
+++ b/sundance.c
@@ -831,7 +831,7 @@ #endif
 	if (np->pci_rev_id >= 0x14)
 		iowrite8(0x01, ioaddr + DebugCtrl1);
 	netif_start_queue(dev);
-	
+
 	spin_lock_irqsave(&np->lock,flags);
 	reset_tx(dev);
 	spin_unlock_irqrestore(&np->lock,flags);
@@ -1076,7 +1076,7 @@ reset_tx (struct net_device *dev)
 	struct sk_buff *skb;
 	int i;
 	int irq = in_interrupt();
-	
+
 	/* Reset tx logic, TxListPtr will be cleaned */
 	iowrite16 (TxDisable, ioaddr + MACCtrl1);
 	iowrite16 (TxReset | DMAReset | FIFOReset | NetworkReset,
@@ -1647,6 +1647,14 @@ static int netdev_close(struct net_devic
 	struct sk_buff *skb;
 	int i;
 
+	/* Wait and kill tasklet */
+	tasklet_kill(&np->rx_tasklet);
+	tasklet_kill(&np->tx_tasklet);
+   np->cur_tx = 0;
+   np->dirty_tx = 0;
+	np->cur_task = 0;
+	np->last_tx = 0;
+
 	netif_stop_queue(dev);
 
 	if (netif_msg_ifdown(np)) {
@@ -1667,9 +1675,20 @@ static int netdev_close(struct net_devic
 	/* Stop the chip's Tx and Rx processes. */
 	iowrite16(TxDisable | RxDisable | StatsDisable, ioaddr + MACCtrl1);
 
-	/* Wait and kill tasklet */
-	tasklet_kill(&np->rx_tasklet);
-	tasklet_kill(&np->tx_tasklet);
+    for (i = 2000; i > 0; i--) {
+		 if ((ioread32(ioaddr + DMACtrl) &0xC000) == 0)
+		    break;
+		 mdelay(1);
+    }	
+
+    iowrite16(GlobalReset | DMAReset | FIFOReset |NetworkReset, ioaddr +ASICCtrl + 2);
+    
+    for (i = 2000; i > 0; i--)
+    {
+		 if ((ioread16(ioaddr + ASICCtrl +2) &ResetBusy) == 0)
+	    	break;
+		 mdelay(1);
+    }
 
 #ifdef __i386__
 	if (netif_msg_hw(np)) {
@@ -1707,6 +1726,7 @@ #endif /* __i386__ debugging only */
 		}
 	}
 	for (i = 0; i < TX_RING_SIZE; i++) {
+		np->tx_ring[i].next_desc = 0;		
 		skb = np->tx_skbuff[i];
 		if (skb) {
 			pci_unmap_single(np->pci_dev,
-- 
1.3.GIT



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