pch_gbe: scale time stamps to nanoseconds

This patch fixes the helper functions that give the transmit and
receive time stamps to return nanoseconds, instead of arbitrary clock
ticks.

[ RC - Rebased Takahiro's changes and wrote a commit message
  explaining the changes. ]

Signed-off-by: Takahiro Shimizu <tshimizu818@gmail.com>
Signed-off-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 2 insertions, 4 deletions

diff --git a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
index 8035e5ff6e06..7c2dabb8cefc 100644
--- a/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
+++ b/drivers/net/ethernet/oki-semi/pch_gbe/pch_gbe_main.c
@@ -101,8 +101,6 @@ const char pch_driver_version[] = DRV_VERSION;
 
 #ifdef CONFIG_PCH_PTP
 /* Macros for ieee1588 */
-#define TICKS_NS_SHIFT  5
-
 /* 0x40 Time Synchronization Channel Control Register Bits */
 #define MASTER_MODE   (1<<0)
 #define SLAVE_MODE    (0<<0)
@@ -183,7 +181,6 @@ static void pch_rx_timestamp(
                 goto out;
 
         ns = pch_rx_snap_read(pdev);
-        ns <<= TICKS_NS_SHIFT;
 
         shhwtstamps = skb_hwtstamps(skb);
         memset(shhwtstamps, 0, sizeof(*shhwtstamps));
@@ -226,7 +223,6 @@ static void pch_tx_timestamp(
         }
 
         ns = pch_tx_snap_read(pdev);
-        ns <<= TICKS_NS_SHIFT;
 
         memset(&shhwtstamps, 0, sizeof(shhwtstamps));
         shhwtstamps.hwtstamp = ns_to_ktime(ns);
diff --git a/drivers/ptp/ptp_pch.c b/drivers/ptp/ptp_pch.c
index 375eb04c16ea..847a3c3e31e4 100644
--- a/drivers/ptp/ptp_pch.c
+++ b/drivers/ptp/ptp_pch.c
@@ -261,6 +261,7 @@ u64 pch_rx_snap_read(struct pci_dev *pdev)
 
         ns = ((u64) hi) << 32;
         ns |= lo;
+        ns <<= TICKS_NS_SHIFT;
 
         return ns;
 }
@@ -277,6 +278,7 @@ u64 pch_tx_snap_read(struct pci_dev *pdev)
 
         ns = ((u64) hi) << 32;
         ns |= lo;
+        ns <<= TICKS_NS_SHIFT;
 
         return ns;
 }