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[IOAT]: ioatdma needs to to play nice in a multi-dma-client world 

Now that the DMA engine has a multi-client interface, fix the ioatdma
driver to play along.  At the same time, remove a couple of unnecessary
reads and writes.

Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shannon Nelson 2007-08-24 23:02:53 -07:00 committed by David S. Miller
parent 97a1ad431b
commit e422397634
1 changed files with 4 additions and 14 deletions
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18
drivers/dma/ioatdma.c
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@ -191,17 +191,12 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan *chan)
int i;
LIST_HEAD(tmp_list);
/*
* In-use bit automatically set by reading chanctrl
* If 0, we got it, if 1, someone else did
*/
chanctrl = readw(ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
if (chanctrl & IOAT_CHANCTRL_CHANNEL_IN_USE)
return -EBUSY;
/* have we already been set up? */
if (!list_empty(&ioat_chan->free_desc))
return INITIAL_IOAT_DESC_COUNT;
/* Setup register to interrupt and write completion status on error */
chanctrl = IOAT_CHANCTRL_CHANNEL_IN_USE |
IOAT_CHANCTRL_ERR_INT_EN |
chanctrl = IOAT_CHANCTRL_ERR_INT_EN |
IOAT_CHANCTRL_ANY_ERR_ABORT_EN |
IOAT_CHANCTRL_ERR_COMPLETION_EN;
writew(chanctrl, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
@ -282,11 +277,6 @@ static void ioat_dma_free_chan_resources(struct dma_chan *chan)
in_use_descs - 1);
ioat_chan->last_completion = ioat_chan->completion_addr = 0;
/* Tell hw the chan is free */
chanctrl = readw(ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
chanctrl &= ~IOAT_CHANCTRL_CHANNEL_IN_USE;
writew(chanctrl, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
}
static struct dma_async_tx_descriptor *