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>

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 710715fcb23dea7765ce3fc579c88fcd29ecb0da..7f5389c3c0cf62dd19cc89f90f98784ecfb8999d 100644 (file)
--- 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);

diff --git a/drivers/net/ethernet/freescale/gianfar.h b/drivers/net/ethernet/freescale/gianfar.h
index 8c1994856e93823174d29c08ed8ae691c1530120..f266b20f9ef5be53e6c55f2579484bb72d8794a1 100644 (file)
--- a/drivers/net/ethernet/freescale/gianfar.h
+++ b/drivers/net/ethernet/freescale/gianfar.h
@@ -340,6 +340,7 @@ extern const char gfar_driver_version[];
 #define IEVENT_MAG             0x00000800
 #define IEVENT_GRSC            0x00000100
 #define IEVENT_RXF0            0x00000080
+#define IEVENT_FGPI            0x00000010
 #define IEVENT_FIR             0x00000008
 #define IEVENT_FIQ             0x00000004
 #define IEVENT_DPE             0x00000002
@@ -372,6 +373,7 @@ extern const char gfar_driver_version[];
 #define IMASK_MAG              0x00000800
 #define IMASK_GRSC              0x00000100
 #define IMASK_RXFEN0           0x00000080
+#define IMASK_FGPI             0x00000010
 #define IMASK_FIR              0x00000008
 #define IMASK_FIQ              0x00000004
 #define IMASK_DPE              0x00000002
@@ -540,6 +542,9 @@ extern const char gfar_driver_version[];
 
 #define GFAR_INT_NAME_MAX      (IFNAMSIZ + 6)  /* '_g#_xx' */
 
+#define GFAR_WOL_MAGIC         0x00000001
+#define GFAR_WOL_FILER_UCAST   0x00000002
+
 struct txbd8
 {
        union {
@@ -917,6 +922,7 @@ struct gfar {
 #define FSL_GIANFAR_DEV_HAS_BD_STASHING                0x00000200
 #define FSL_GIANFAR_DEV_HAS_BUF_STASHING       0x00000400
 #define FSL_GIANFAR_DEV_HAS_TIMER              0x00000800
+#define FSL_GIANFAR_DEV_HAS_WAKE_ON_FILER      0x00001000
 
 #if (MAXGROUPS == 2)
 #define DEFAULT_MAPPING        0xAA
@@ -1161,8 +1167,6 @@ struct gfar_private {
                extended_hash:1,
                bd_stash_en:1,
                rx_filer_enable:1,
-               /* Wake-on-LAN enabled */
-               wol_en:1,
                /* Enable priorty based Tx scheduling in Hw */
                prio_sched_en:1,
                /* Flow control flags */
@@ -1191,6 +1195,10 @@ struct gfar_private {
        u32 __iomem *hash_regs[16];
        int hash_width;
 
+       /* wake-on-lan settings */
+       u16 wol_opts;
+       u16 wol_supported;
+
        /*Filer table*/
        unsigned int ftp_rqfpr[MAX_FILER_IDX + 1];
        unsigned int ftp_rqfcr[MAX_FILER_IDX + 1];

diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
index 6bdc89179b72d6487d031ecda8551453b9268cd4..fb7f8d67aef43f401b3bf78369b3c07ff8a478ec 100644 (file)
--- 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;
 }