diff options
| author | Shannon Nelson <shannon.nelson@intel.com> | 2007-08-24 23:02:53 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-08-26 18:35:40 -0700 |
| commit | e4223976341ffb22fabe5b3a69873966808c83aa (patch) | |
| tree | 8375db74c6243e583eeaff91d5d50ca96632a55d /drivers/dma | |
| parent | 97a1ad431b89765755d2b5aa8c0777ed637d5c4a (diff) | |
[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>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/ioatdma.c | 18 |
1 files changed, 4 insertions, 14 deletions
diff --git a/drivers/dma/ioatdma.c b/drivers/dma/ioatdma.c index 2d1f17865b6..41b18c5a314 100644 --- a/drivers/dma/ioatdma.c +++ b/drivers/dma/ioatdma.c @@ -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 * |