ioatdma: Add 64bit chansts register read for ioat v3.3.

The channel status register for v3.3 is now 64bit. Use readq if available
on v3.3 platforms.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Acked-by: Dan Williams <djbw@fb.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 21 insertions, 1 deletions

diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 95ae7b3139ec..9285caadf825 100644
--- a/drivers/dma/ioat/dma.h
+++ b/drivers/dma/ioat/dma.h
@@ -201,7 +201,7 @@ ioat_chan_by_index(struct ioatdma_device *device, int index)
         return device->idx[index];
 }
 
-static inline u64 ioat_chansts(struct ioat_chan_common *chan)
+static inline u64 ioat_chansts_32(struct ioat_chan_common *chan)
 {
         u8 ver = chan->device->version;
         u64 status;
@@ -218,6 +218,26 @@ static inline u64 ioat_chansts(struct ioat_chan_common *chan)
         return status;
 }
 
+#if BITS_PER_LONG == 64
+
+static inline u64 ioat_chansts(struct ioat_chan_common *chan)
+{
+        u8 ver = chan->device->version;
+        u64 status;
+
+         /* With IOAT v3.3 the status register is 64bit.  */
+        if (ver >= IOAT_VER_3_3)
+                status = readq(chan->reg_base + IOAT_CHANSTS_OFFSET(ver));
+        else
+                status = ioat_chansts_32(chan);
+
+        return status;
+}
+
+#else
+#define ioat_chansts ioat_chansts_32
+#endif
+
 static inline void ioat_start(struct ioat_chan_common *chan)
 {
         u8 ver = chan->device->version;