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authorAyaz Abdulla <aabdulla@nvidia.com>2009-05-01 01:41:50 +0000
committerDavid S. Miller <davem@davemloft.net>2009-05-01 15:30:45 -0700
commit88d7d8b00cdc3117150faab4c4ace6d464b71c22 (patch)
tree86e114a66f9fb2e76a892876101f8a5e4959ac20
parent1aec5bdfed91b50aedbcad43393bcb05033c7ef3 (diff)
downloadlinux-88d7d8b00cdc3117150faab4c4ace6d464b71c22.tar.gz
forcedeth: add clock gating feature <resend>
This patch adds new logic to support a clock gating feature found on the latest set of chipsets. The clock gating is performed on the tx/rx engines when the link is disconnected. Clock gating helps in reducing power consumption. * modified based on comments from netdev Signed-off-by: Ayaz Abdulla <aabdulla@nvidia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/forcedeth.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/net/forcedeth.c b/drivers/net/forcedeth.c
index f9a846b1b92f..d0b1d9f17a5d 100644
--- a/drivers/net/forcedeth.c
+++ b/drivers/net/forcedeth.c
@@ -343,6 +343,7 @@ enum {
#define NVREG_POWERSTATE2_POWERUP_MASK 0x0F15
#define NVREG_POWERSTATE2_POWERUP_REV_A3 0x0001
#define NVREG_POWERSTATE2_PHY_RESET 0x0004
+#define NVREG_POWERSTATE2_GATE_CLOCKS 0x0F00
};
/* Big endian: should work, but is untested */
@@ -1017,6 +1018,23 @@ static int using_multi_irqs(struct net_device *dev)
return 1;
}
+static void nv_txrx_gate(struct net_device *dev, bool gate)
+{
+ struct fe_priv *np = get_nvpriv(dev);
+ u8 __iomem *base = get_hwbase(dev);
+ u32 powerstate;
+
+ if (!np->mac_in_use &&
+ (np->driver_data & DEV_HAS_POWER_CNTRL)) {
+ powerstate = readl(base + NvRegPowerState2);
+ if (gate)
+ powerstate |= NVREG_POWERSTATE2_GATE_CLOCKS;
+ else
+ powerstate &= ~NVREG_POWERSTATE2_GATE_CLOCKS;
+ writel(powerstate, base + NvRegPowerState2);
+ }
+}
+
static void nv_enable_irq(struct net_device *dev)
{
struct fe_priv *np = get_nvpriv(dev);
@@ -3394,12 +3412,14 @@ static void nv_linkchange(struct net_device *dev)
if (!netif_carrier_ok(dev)) {
netif_carrier_on(dev);
printk(KERN_INFO "%s: link up.\n", dev->name);
+ nv_txrx_gate(dev, false);
nv_start_rx(dev);
}
} else {
if (netif_carrier_ok(dev)) {
netif_carrier_off(dev);
printk(KERN_INFO "%s: link down.\n", dev->name);
+ nv_txrx_gate(dev, true);
nv_stop_rx(dev);
}
}
@@ -5327,6 +5347,7 @@ static int nv_open(struct net_device *dev)
mii_rw(dev, np->phyaddr, MII_BMCR,
mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ) & ~BMCR_PDOWN);
+ nv_txrx_gate(dev, false);
/* erase previous misconfiguration */
if (np->driver_data & DEV_HAS_POWER_CNTRL)
nv_mac_reset(dev);
@@ -5514,12 +5535,14 @@ static int nv_close(struct net_device *dev)
nv_drain_rxtx(dev);
if (np->wolenabled) {
+ nv_txrx_gate(dev, false);
writel(NVREG_PFF_ALWAYS|NVREG_PFF_MYADDR, base + NvRegPacketFilterFlags);
nv_start_rx(dev);
} else {
/* power down phy */
mii_rw(dev, np->phyaddr, MII_BMCR,
mii_rw(dev, np->phyaddr, MII_BMCR, MII_READ)|BMCR_PDOWN);
+ nv_txrx_gate(dev, true);
}
/* FIXME: power down nic */