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authorDave Jiang <dave.jiang@intel.com>2013-03-26 15:42:41 -0700
committerVinod Koul <vinod.koul@intel.com>2013-04-15 09:51:20 +0530
commitd92a8d7cbb6941d5d985ccb3453a2ac5c92f60e4 (patch)
tree37146d568d6022714cfc3a65d90f12eaf12fba13 /drivers/dma/ioat
parent0132bcef76301a8dc7794c893fd9342a04059082 (diff)
downloadop-kernel-dev-d92a8d7cbb6941d5d985ccb3453a2ac5c92f60e4.zip
op-kernel-dev-d92a8d7cbb6941d5d985ccb3453a2ac5c92f60e4.tar.gz
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>
Diffstat (limited to 'drivers/dma/ioat')
-rw-r--r--drivers/dma/ioat/dma.h22
1 files changed, 21 insertions, 1 deletions
diff --git a/drivers/dma/ioat/dma.h b/drivers/dma/ioat/dma.h
index 95ae7b3..9285caa 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;
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