net: add Runtime PM to the sh_eth driver

Add Runtime PM support to the sh_eth driver.

The clock to the ethernet hardware block will be
enabled as long as the network device is up.

Signed-off-by: Magnus Damm <damm@opensource.se>
Tested-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 34 insertions, 2 deletions

diff --git a/drivers/net/sh_eth.c b/drivers/net/sh_eth.c
index a4da7e7574eb..161181a4b3d6 100644
--- a/drivers/net/sh_eth.c
+++ b/drivers/net/sh_eth.c
@@ -30,7 +30,7 @@
 #include <linux/phy.h>
 #include <linux/cache.h>
 #include <linux/io.h>
-
+#include <linux/pm_runtime.h>
 #include "sh_eth.h"
 
 /* There is CPU dependent code */
@@ -1012,6 +1012,8 @@ static int sh_eth_open(struct net_device *ndev)
         int ret = 0;
         struct sh_eth_private *mdp = netdev_priv(ndev);
 
+        pm_runtime_get_sync(&mdp->pdev->dev);
+
         ret = request_irq(ndev->irq, &sh_eth_interrupt,
 #if defined(CONFIG_CPU_SUBTYPE_SH7763) || defined(CONFIG_CPU_SUBTYPE_SH7764)
                                 IRQF_SHARED,
@@ -1048,6 +1050,7 @@ static int sh_eth_open(struct net_device *ndev)
 
 out_free_irq:
         free_irq(ndev->irq, ndev);
+        pm_runtime_put_sync(&mdp->pdev->dev);
         return ret;
 }
 
@@ -1179,6 +1182,8 @@ static int sh_eth_close(struct net_device *ndev)
         ringsize = sizeof(struct sh_eth_txdesc) * TX_RING_SIZE;
         dma_free_coherent(NULL, ringsize, mdp->tx_ring, mdp->tx_desc_dma);
 
+        pm_runtime_put_sync(&mdp->pdev->dev);
+
         return 0;
 }
 
@@ -1187,6 +1192,8 @@ static struct net_device_stats *sh_eth_get_stats(struct net_device *ndev)
         struct sh_eth_private *mdp = netdev_priv(ndev);
         u32 ioaddr = ndev->base_addr;
 
+        pm_runtime_get_sync(&mdp->pdev->dev);
+
         mdp->stats.tx_dropped += ctrl_inl(ioaddr + TROCR);
         ctrl_outl(0, ioaddr + TROCR);   /* (write clear) */
         mdp->stats.collisions += ctrl_inl(ioaddr + CDCR);
@@ -1202,6 +1209,8 @@ static struct net_device_stats *sh_eth_get_stats(struct net_device *ndev)
         mdp->stats.tx_carrier_errors += ctrl_inl(ioaddr + CNDCR);
         ctrl_outl(0, ioaddr + CNDCR);   /* (write clear) */
 #endif
+        pm_runtime_put_sync(&mdp->pdev->dev);
+
         return &mdp->stats;
 }
 
@@ -1410,6 +1419,9 @@ static int sh_eth_drv_probe(struct platform_device *pdev)
 
         mdp = netdev_priv(ndev);
         spin_lock_init(&mdp->lock);
+        mdp->pdev = pdev;
+        pm_runtime_enable(&pdev->dev);
+        pm_runtime_resume(&pdev->dev);
 
         pd = (struct sh_eth_plat_data *)(pdev->dev.platform_data);
         /* get PHY ID */
@@ -1485,18 +1497,37 @@ static int sh_eth_drv_remove(struct platform_device *pdev)
         sh_mdio_release(ndev);
         unregister_netdev(ndev);
         flush_scheduled_work();
-
+        pm_runtime_disable(&pdev->dev);
         free_netdev(ndev);
         platform_set_drvdata(pdev, NULL);
 
         return 0;
 }
 
+static int sh_eth_runtime_nop(struct device *dev)
+{
+        /*
+         * Runtime PM callback shared between ->runtime_suspend()
+         * and ->runtime_resume(). Simply returns success.
+         *
+         * This driver re-initializes all registers after
+         * pm_runtime_get_sync() anyway so there is no need
+         * to save and restore registers here.
+         */
+        return 0;
+}
+
+static struct dev_pm_ops sh_eth_dev_pm_ops = {
+        .runtime_suspend = sh_eth_runtime_nop,
+        .runtime_resume = sh_eth_runtime_nop,
+};
+
 static struct platform_driver sh_eth_driver = {
         .probe = sh_eth_drv_probe,
         .remove = sh_eth_drv_remove,
         .driver = {
                    .name = CARDNAME,
+                   .pm = &sh_eth_dev_pm_ops,
         },
 };
 
diff --git a/drivers/net/sh_eth.h b/drivers/net/sh_eth.h
index ba151f86ae7b..8b47763958f2 100644
--- a/drivers/net/sh_eth.h
+++ b/drivers/net/sh_eth.h
@@ -703,6 +703,7 @@ struct sh_eth_cpu_data {
 };
 
 struct sh_eth_private {
+        struct platform_device *pdev;
         struct sh_eth_cpu_data *cd;
         dma_addr_t rx_desc_dma;
         dma_addr_t tx_desc_dma;