gianfar: Add WAKE_UCAST and "wake-on-filer" support

This enables eTSEC's filer (Rx parser) and the FGPI Rx
interrupt (Filer General Purpose Interrupt) as a wakeup
source event.

Upon entering suspend state, the eTSEC filer is given
a rule to match incoming L2 unicast packets.  A packet
matching the rule will be enqueued in the Rx ring and
a FGPI Rx interrupt will be asserted by the filer to
wakeup the system.  Other packet types will be dropped.
On resume the filer table is restored to the content
before entering suspend state.
The set of rules from gfar_filer_config_wol() could be
extended to implement other WoL capabilities as well.

The "fsl,wake-on-filer" DT binding enables this capability
on certain platforms that feature the necessary power
management infrastructure, targeting mainly printing and
imaging applications.
(refer to Power Management section of the SoC Ref Man)

Cc: Li Yang <leoli@freescale.com>
Cc: Zhao Chenhui <chenhui.zhao@freescale.com>

Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 32 insertions, 11 deletions

diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
index 6bdc89179b72..fb7f8d67aef4 100644
--- a/drivers/net/ethernet/freescale/gianfar_ethtool.c
+++ b/drivers/net/ethernet/freescale/gianfar_ethtool.c
@@ -644,28 +644,49 @@ static void gfar_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 {
 	struct gfar_private *priv = netdev_priv(dev);
 
-	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET) {
-		wol->supported = WAKE_MAGIC;
-		wol->wolopts = priv->wol_en ? WAKE_MAGIC : 0;
-	} else {
-		wol->supported = wol->wolopts = 0;
-	}
+	wol->supported = 0;
+	wol->wolopts = 0;
+
+	if (priv->wol_supported & GFAR_WOL_MAGIC)
+		wol->supported |= WAKE_MAGIC;
+
+	if (priv->wol_supported & GFAR_WOL_FILER_UCAST)
+		wol->supported |= WAKE_UCAST;
+
+	if (priv->wol_opts & GFAR_WOL_MAGIC)
+		wol->wolopts |= WAKE_MAGIC;
+
+	if (priv->wol_opts & GFAR_WOL_FILER_UCAST)
+		wol->wolopts |= WAKE_UCAST;
 }
 
 static int gfar_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
 {
 	struct gfar_private *priv = netdev_priv(dev);
+	u16 wol_opts = 0;
+	int err;
 
-	if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET) &&
-	    wol->wolopts != 0)
+	if (!priv->wol_supported && wol->wolopts)
 		return -EINVAL;
 
-	if (wol->wolopts & ~WAKE_MAGIC)
+	if (wol->wolopts & ~(WAKE_MAGIC | WAKE_UCAST))
 		return -EINVAL;
 
-	device_set_wakeup_enable(&dev->dev, wol->wolopts & WAKE_MAGIC);
+	if (wol->wolopts & WAKE_MAGIC) {
+		wol_opts |= GFAR_WOL_MAGIC;
+	} else {
+		if (wol->wolopts & WAKE_UCAST)
+			wol_opts |= GFAR_WOL_FILER_UCAST;
+	}
+
+	wol_opts &= priv->wol_supported;
+	priv->wol_opts = 0;
+
+	err = device_set_wakeup_enable(priv->dev, wol_opts);
+	if (err)
+		return err;
 
-	priv->wol_en = !!device_may_wakeup(&dev->dev);
+	priv->wol_opts = wol_opts;
 
 	return 0;
 }