net: qcom/emac: add shutdown function

The shutdown function halts all DMA and interrupts, so that all
operations are discontinued when the system shuts down, e.g. via
kexec or a forced reboot.

Tested-by: Tyler Baicar <tbaicar@codeaurora.org>
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/qualcomm/emac/emac.c b/drivers/net/ethernet/qualcomm/emac/emac.c
index 98a326faea294eec0c59f9b0ffe15d57046ce5eb..77c5c929f141574cb3ee8efc83a5e24281321dfa 100644 (file)
--- a/drivers/net/ethernet/qualcomm/emac/emac.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac.c
@@ -762,6 +762,19 @@ static int emac_remove(struct platform_device *pdev)
        return 0;
 }
 
+static void emac_shutdown(struct platform_device *pdev)
+{
+       struct net_device *netdev = dev_get_drvdata(&pdev->dev);
+       struct emac_adapter *adpt = netdev_priv(netdev);
+       struct emac_sgmii *sgmii = &adpt->phy;
+
+       /* Closing the SGMII turns off its interrupts */
+       sgmii->close(adpt);
+
+       /* Resetting the MAC turns off all DMA and its interrupts */
+       emac_mac_reset(adpt);
+}
+
 static struct platform_driver emac_platform_driver = {
        .probe  = emac_probe,
        .remove = emac_remove,
@@ -770,6 +783,7 @@ static struct platform_driver emac_platform_driver = {
                .of_match_table = emac_dt_match,
                .acpi_match_table = ACPI_PTR(emac_acpi_match),
        },
+       .shutdown = emac_shutdown,
 };
 
 module_platform_driver(emac_platform_driver);