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, 144 insertions, 11 deletions

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 710715fcb23d..7f5389c3c0cf 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -907,6 +907,9 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)
 	if (of_find_property(np, "fsl,magic-packet", NULL))
 		priv->device_flags |= FSL_GIANFAR_DEV_HAS_MAGIC_PACKET;
 
+	if (of_get_property(np, "fsl,wake-on-filer", NULL))
+		priv->device_flags |= FSL_GIANFAR_DEV_HAS_WAKE_ON_FILER;
+
 	priv->phy_node = of_parse_phandle(np, "phy-handle", 0);
 
 	/* In the case of a fixed PHY, the DT node associated
@@ -1415,8 +1418,14 @@ static int gfar_probe(struct platform_device *ofdev)
 		goto register_fail;
 	}
 
-	device_set_wakeup_capable(&dev->dev, priv->device_flags &
-				  FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
+	if (priv->device_flags & FSL_GIANFAR_DEV_HAS_MAGIC_PACKET)
+		priv->wol_supported |= GFAR_WOL_MAGIC;
+
+	if ((priv->device_flags & FSL_GIANFAR_DEV_HAS_WAKE_ON_FILER) &&
+	    priv->rx_filer_enable)
+		priv->wol_supported |= GFAR_WOL_FILER_UCAST;
+
+	device_set_wakeup_capable(&ofdev->dev, priv->wol_supported);
 
 	/* fill out IRQ number and name fields */
 	for (i = 0; i < priv->num_grps; i++) {
@@ -1479,15 +1488,122 @@ static int gfar_remove(struct platform_device *ofdev)
 
 #ifdef CONFIG_PM
 
+static void __gfar_filer_disable(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 temp;
+
+	temp = gfar_read(&regs->rctrl);
+	temp &= ~(RCTRL_FILREN | RCTRL_PRSDEP_INIT);
+	gfar_write(&regs->rctrl, temp);
+}
+
+static void __gfar_filer_enable(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 temp;
+
+	temp = gfar_read(&regs->rctrl);
+	temp |= RCTRL_FILREN | RCTRL_PRSDEP_INIT;
+	gfar_write(&regs->rctrl, temp);
+}
+
+/* Filer rules implementing wol capabilities */
+static void gfar_filer_config_wol(struct gfar_private *priv)
+{
+	unsigned int i;
+	u32 rqfcr;
+
+	__gfar_filer_disable(priv);
+
+	/* clear the filer table, reject any packet by default */
+	rqfcr = RQFCR_RJE | RQFCR_CMP_MATCH;
+	for (i = 0; i <= MAX_FILER_IDX; i++)
+		gfar_write_filer(priv, i, rqfcr, 0);
+
+	i = 0;
+	if (priv->wol_opts & GFAR_WOL_FILER_UCAST) {
+		/* unicast packet, accept it */
+		struct net_device *ndev = priv->ndev;
+		/* get the default rx queue index */
+		u8 qindex = (u8)priv->gfargrp[0].rx_queue->qindex;
+		u32 dest_mac_addr = (ndev->dev_addr[0] << 16) |
+				    (ndev->dev_addr[1] << 8) |
+				     ndev->dev_addr[2];
+
+		rqfcr = (qindex << 10) | RQFCR_AND |
+			RQFCR_CMP_EXACT | RQFCR_PID_DAH;
+
+		gfar_write_filer(priv, i++, rqfcr, dest_mac_addr);
+
+		dest_mac_addr = (ndev->dev_addr[3] << 16) |
+				(ndev->dev_addr[4] << 8) |
+				 ndev->dev_addr[5];
+		rqfcr = (qindex << 10) | RQFCR_GPI |
+			RQFCR_CMP_EXACT | RQFCR_PID_DAL;
+		gfar_write_filer(priv, i++, rqfcr, dest_mac_addr);
+	}
+
+	__gfar_filer_enable(priv);
+}
+
+static void gfar_filer_restore_table(struct gfar_private *priv)
+{
+	u32 rqfcr, rqfpr;
+	unsigned int i;
+
+	__gfar_filer_disable(priv);
+
+	for (i = 0; i <= MAX_FILER_IDX; i++) {
+		rqfcr = priv->ftp_rqfcr[i];
+		rqfpr = priv->ftp_rqfpr[i];
+		gfar_write_filer(priv, i, rqfcr, rqfpr);
+	}
+
+	__gfar_filer_enable(priv);
+}
+
+/* gfar_start() for Rx only and with the FGPI filer interrupt enabled */
+static void gfar_start_wol_filer(struct gfar_private *priv)
+{
+	struct gfar __iomem *regs = priv->gfargrp[0].regs;
+	u32 tempval;
+	int i = 0;
+
+	/* Enable Rx hw queues */
+	gfar_write(&regs->rqueue, priv->rqueue);
+
+	/* Initialize DMACTRL to have WWR and WOP */
+	tempval = gfar_read(&regs->dmactrl);
+	tempval |= DMACTRL_INIT_SETTINGS;
+	gfar_write(&regs->dmactrl, tempval);
+
+	/* Make sure we aren't stopped */
+	tempval = gfar_read(&regs->dmactrl);
+	tempval &= ~DMACTRL_GRS;
+	gfar_write(&regs->dmactrl, tempval);
+
+	for (i = 0; i < priv->num_grps; i++) {
+		regs = priv->gfargrp[i].regs;
+		/* Clear RHLT, so that the DMA starts polling now */
+		gfar_write(&regs->rstat, priv->gfargrp[i].rstat);
+		/* enable the Filer General Purpose Interrupt */
+		gfar_write(&regs->imask, IMASK_FGPI);
+	}
+
+	/* Enable Rx DMA */
+	tempval = gfar_read(&regs->maccfg1);
+	tempval |= MACCFG1_RX_EN;
+	gfar_write(&regs->maccfg1, tempval);
+}
+
 static int gfar_suspend(struct device *dev)
 {
 	struct gfar_private *priv = dev_get_drvdata(dev);
 	struct net_device *ndev = priv->ndev;
 	struct gfar __iomem *regs = priv->gfargrp[0].regs;
 	u32 tempval;
-	int magic_packet = priv->wol_en &&
-			   (priv->device_flags &
-			    FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
+	u16 wol = priv->wol_opts;
 
 	if (!netif_running(ndev))
 		return 0;
@@ -1499,7 +1615,7 @@ static int gfar_suspend(struct device *dev)
 
 	gfar_halt(priv);
 
-	if (magic_packet) {
+	if (wol & GFAR_WOL_MAGIC) {
 		/* Enable interrupt on Magic Packet */
 		gfar_write(&regs->imask, IMASK_MAG);
 
@@ -1513,6 +1629,10 @@ static int gfar_suspend(struct device *dev)
 		tempval |= MACCFG1_RX_EN;
 		gfar_write(&regs->maccfg1, tempval);
 
+	} else if (wol & GFAR_WOL_FILER_UCAST) {
+		gfar_filer_config_wol(priv);
+		gfar_start_wol_filer(priv);
+
 	} else {
 		phy_stop(priv->phydev);
 	}
@@ -1526,18 +1646,22 @@ static int gfar_resume(struct device *dev)
 	struct net_device *ndev = priv->ndev;
 	struct gfar __iomem *regs = priv->gfargrp[0].regs;
 	u32 tempval;
-	int magic_packet = priv->wol_en &&
-			   (priv->device_flags &
-			    FSL_GIANFAR_DEV_HAS_MAGIC_PACKET);
+	u16 wol = priv->wol_opts;
 
 	if (!netif_running(ndev))
 		return 0;
 
-	if (magic_packet) {
+	if (wol & GFAR_WOL_MAGIC) {
 		/* Disable Magic Packet mode */
 		tempval = gfar_read(&regs->maccfg2);
 		tempval &= ~MACCFG2_MPEN;
 		gfar_write(&regs->maccfg2, tempval);
+
+	} else if (wol & GFAR_WOL_FILER_UCAST) {
+		/* need to stop rx only, tx is already down */
+		gfar_halt(priv);
+		gfar_filer_restore_table(priv);
+
 	} else {
 		phy_start(priv->phydev);
 	}
@@ -1998,6 +2122,8 @@ static int register_grp_irqs(struct gfar_priv_grp *grp)
 				  gfar_irq(grp, RX)->irq);
 			goto rx_irq_fail;
 		}
+		enable_irq_wake(gfar_irq(grp, RX)->irq);
+
 	} else {
 		err = request_irq(gfar_irq(grp, TX)->irq, gfar_interrupt, 0,
 				  gfar_irq(grp, TX)->name, grp);
@@ -2743,7 +2869,14 @@ irqreturn_t gfar_receive(int irq, void *grp_id)
 {
 	struct gfar_priv_grp *grp = (struct gfar_priv_grp *)grp_id;
 	unsigned long flags;
-	u32 imask;
+	u32 imask, ievent;
+
+	ievent = gfar_read(&grp->regs->ievent);
+
+	if (unlikely(ievent & IEVENT_FGPI)) {
+		gfar_write(&grp->regs->ievent, IEVENT_FGPI);
+		return IRQ_HANDLED;
+	}
 
 	if (likely(napi_schedule_prep(&grp->napi_rx))) {
 		spin_lock_irqsave(&grp->grplock, flags);