linux-kernel - [PATCH 02/10] ioatdma: Add 64bit chansts register read for ioat v3.3.

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Date:	Tue, 26 Mar 2013 15:42:41 -0700
From:	Dave Jiang <dave.jiang@...el.com>
To:	djbw@...com
Cc:	vinod.koul@...el.com, linux-kernel@...r.kernel.org
Subject: [PATCH 02/10] 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@...el.com>
---
 drivers/dma/ioat/dma.h |   22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

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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