SMC911x driver fixed for NFS boot

eth_halt() function in the smc911x drivers used to call the
smc911x_reset() function. eth_halt() used to be called after
tftp transfers. This used to put the ethernet chip in reset
while the linux boots up resulting in the ethernet driver
not coming up. NFS boot used to fail as a result.

This patch calls smc911x_shutdown() instead of smc911x_reset().
Some comments received has also been fixed.

Signed-off-by: Manikandan Pillai <mani.pillai@ti.com>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>

drivers/net/smc911x.c

diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
index 8c9a2a8..455b055 100644
--- a/drivers/net/smc911x.c
+++ b/drivers/net/smc911x.c
@@ -117,6 +117,27 @@
 	return 0;
 }
 
+static void smc911x_shutdown(void)
+{
+	unsigned int cr;
+
+	/* Turn of Rx and TX */
+	cr = smc911x_get_mac_csr(MAC_CR);
+	cr &= ~(MAC_CR_TXEN | MAC_CR_RXEN | MAC_CR_HBDIS);
+	smc911x_set_mac_csr(MAC_CR, cr);
+
+	/* Stop Transmission */
+	cr = smc911x_get_mac_csr(TX_CFG);
+	cr &= ~(TX_CFG_STOP_TX);
+	smc911x_set_mac_csr(TX_CFG, cr);
+	/* Stop receiving packets */
+	cr = smc911x_get_mac_csr(RX_CFG);
+	cr &= ~(RX_CFG_RXDOFF);
+	smc911x_set_mac_csr(RX_CFG, cr);
+
+}
+
+
 static void smc911x_phy_configure(void)
 {
 	int timeout;
@@ -225,7 +246,7 @@
 
 void eth_halt(void)
 {
-	smc911x_reset();
+	smc911x_shutdown();
 }
 
 int eth_rx(void)