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

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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>
This commit is contained in:
Dave Jiang 2013-03-26 15:42:41 -07:00 committed by Vinod Koul
parent 0132bcef76
commit d92a8d7cbb
1 changed files with 21 additions and 1 deletions
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22
drivers/dma/ioat/dma.h
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@ -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;