stmmac: convert to dev_pm_ops.

This patch updates the PM support using the dev_pm_ops
and reviews the hibernation support.
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/stmmac/stmmac.h

@@ -77,7 +77,6 @@ struct stmmac_priv {
 	spinlock_t lock;
 	int wolopts;
 	int wolenabled;
-	int shutdown;
 #ifdef CONFIG_STMMAC_TIMER
 	struct stmmac_timer *tm;
 #endif

drivers/net/stmmac/stmmac_main.c

@@ -844,8 +844,6 @@ static int stmmac_open(struct net_device *dev)
 	if (priv->plat->tx_coe)
 		pr_info("\tTX Checksum insertion supported\n");
 
-	priv->shutdown = 0;
-
 	/* Initialise the MMC (if present) to disable all interrupts. */
 	writel(0xffffffff, priv->ioaddr + MMC_HIGH_INTR_MASK);
 	writel(0xffffffff, priv->ioaddr + MMC_LOW_INTR_MASK);
@@ -1799,20 +1797,19 @@ static int stmmac_dvr_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM
-static int stmmac_suspend(struct platform_device *pdev, pm_message_t state)
+static int stmmac_suspend(struct device *dev)
 {
-	struct net_device *dev = platform_get_drvdata(pdev);
-	struct stmmac_priv *priv = netdev_priv(dev);
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
 	int dis_ic = 0;
 
-	if (!dev || !netif_running(dev))
+	if (!ndev || !netif_running(ndev))
 		return 0;
 
 	spin_lock(&priv->lock);
 
-	if (state.event == PM_EVENT_SUSPEND) {
-		netif_device_detach(dev);
-		netif_stop_queue(dev);
+	netif_device_detach(ndev);
+	netif_stop_queue(ndev);
 	if (priv->phydev)
 		phy_stop(priv->phydev);
 
@@ -1832,28 +1829,21 @@ static int stmmac_suspend(struct platform_device *pdev, pm_message_t state)
 	priv->hw->desc->init_tx_desc(priv->dma_tx, priv->dma_tx_size);
 
 	/* Enable Power down mode by programming the PMT regs */
-		if (device_can_wakeup(priv->device))
+	if (device_may_wakeup(priv->device))
 		priv->hw->mac->pmt(priv->ioaddr, priv->wolopts);
 	else
 		stmmac_disable_mac(priv->ioaddr);
-	} else {
-		priv->shutdown = 1;
-		/* Although this can appear slightly redundant it actually
-		 * makes fast the standby operation and guarantees the driver
-		 * working if hibernation is on media. */
-		stmmac_release(dev);
-	}
 
 	spin_unlock(&priv->lock);
 	return 0;
 }
 
-static int stmmac_resume(struct platform_device *pdev)
+static int stmmac_resume(struct device *dev)
 {
-	struct net_device *dev = platform_get_drvdata(pdev);
-	struct stmmac_priv *priv = netdev_priv(dev);
+	struct net_device *ndev = dev_get_drvdata(dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
 
-	if (!netif_running(dev))
+	if (!netif_running(ndev))
 		return 0;
 
 	if (priv->shutdown) {
@@ -1870,10 +1860,10 @@ static int stmmac_resume(struct platform_device *pdev)
 	 * is received. Anyway, it's better to manually clear
 	 * this bit because it can generate problems while resuming
 	 * from another devices (e.g. serial console). */
-	if (device_can_wakeup(priv->device))
+	if (device_may_wakeup(priv->device))
 		priv->hw->mac->pmt(priv->ioaddr, 0);
 
-	netif_device_attach(dev);
+	netif_device_attach(ndev);
 
 	/* Enable the MAC and DMA */
 	stmmac_enable_mac(priv->ioaddr);
@@ -1881,6 +1871,7 @@ static int stmmac_resume(struct platform_device *pdev)
 	priv->hw->dma->start_rx(priv->ioaddr);
 
 #ifdef CONFIG_STMMAC_TIMER
+	if (likely(priv->tm->enable))
 		priv->tm->timer_start(tmrate);
 #endif
 	napi_enable(&priv->napi);
@@ -1888,24 +1879,51 @@ static int stmmac_resume(struct platform_device *pdev)
 	if (priv->phydev)
 		phy_start(priv->phydev);
 
-	netif_start_queue(dev);
+	netif_start_queue(ndev);
 
 	spin_unlock(&priv->lock);
 	return 0;
 }
-#endif
+
+static int stmmac_freeze(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+
+	if (!ndev || !netif_running(ndev))
+		return 0;
+
+	return stmmac_release(ndev);
+}
+
+static int stmmac_restore(struct device *dev)
+{
+	struct net_device *ndev = dev_get_drvdata(dev);
+
+	if (!ndev || !netif_running(ndev))
+		return 0;
+
+	return stmmac_open(ndev);
+}
+
+static const struct dev_pm_ops stmmac_pm_ops = {
+	.suspend = stmmac_suspend,
+	.resume = stmmac_resume,
+	.freeze = stmmac_freeze,
+	.thaw = stmmac_restore,
+	.restore = stmmac_restore,
+};
+#else
+static const struct dev_pm_ops stmmac_pm_ops;
+#endif /* CONFIG_PM */
 
 static struct platform_driver stmmac_driver = {
+	.probe = stmmac_dvr_probe,
+	.remove = stmmac_dvr_remove,
 	.driver = {
 		.name = STMMAC_RESOURCE_NAME,
+		.owner = THIS_MODULE,
+		.pm = &stmmac_pm_ops,
 	},
-	.probe = stmmac_dvr_probe,
-	.remove = stmmac_dvr_remove,
-#ifdef CONFIG_PM
-	.suspend = stmmac_suspend,
-	.resume = stmmac_resume,
-#endif
-
 };
 
 /**