macb: Basic suspend/resume support

This implements suspend and resume callbacks for the macb driver. We may
have to do some more to gracefully shut the MAC down, but this at least
prevents the macb from waking the system when hooked up to a busy
network.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: Patrice Vilchez <patrice.vilchez@rfo.atmel.com>
Cc: Nicolas FERRE <nicolas.ferre@rfo.atmel.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index 92dccd43bdca..0a5745a854c7 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -1277,8 +1277,45 @@ static int __exit macb_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM
+static int macb_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct net_device *netdev = platform_get_drvdata(pdev);
+        struct macb *bp = netdev_priv(netdev);
+
+        netif_device_detach(netdev);
+
+#ifndef CONFIG_ARCH_AT91
+        clk_disable(bp->hclk);
+#endif
+        clk_disable(bp->pclk);
+
+        return 0;
+}
+
+static int macb_resume(struct platform_device *pdev)
+{
+        struct net_device *netdev = platform_get_drvdata(pdev);
+        struct macb *bp = netdev_priv(netdev);
+
+        clk_enable(bp->pclk);
+#ifndef CONFIG_ARCH_AT91
+        clk_enable(bp->hclk);
+#endif
+
+        netif_device_attach(netdev);
+
+        return 0;
+}
+#else
+#define macb_suspend    NULL
+#define macb_resume     NULL
+#endif
+
 static struct platform_driver macb_driver = {
         .remove         = __exit_p(macb_remove),
+        .suspend        = macb_suspend,
+        .resume         = macb_resume,
         .driver         = {
                 .name           = "macb",
                 .owner  = THIS_MODULE,