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| author | Linus Walleij <linus.walleij@stericsson.com> | 2010-03-26 16:44:01 -0700 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2010-03-26 16:44:01 -0700 |
| commit | c3635c78e500a52c9fcd55de381a72928d9e054d (patch) | |
| tree | 87403f402227cd8b5572550e70facf81c9eaa0d9 /drivers/dma/dw_dmac.c | |
| parent | 0f65169b1bf44220308e1ce1f6666ad03ddc27af (diff) | |
| download | linux-c3635c78e500a52c9fcd55de381a72928d9e054d.tar.gz linux-c3635c78e500a52c9fcd55de381a72928d9e054d.tar.bz2 linux-c3635c78e500a52c9fcd55de381a72928d9e054d.zip | |
DMAENGINE: generic slave control v2
Convert the device_terminate_all() operation on the
DMA engine to a generic device_control() operation
which can now optionally support also pausing and
resuming DMA on a certain channel. Implemented for the
COH 901 318 DMAC as an example.
[dan.j.williams@intel.com: update for timberdale]
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Li Yang <leoli@freescale.com>
Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: Paul Mundt <lethal@linux-sh.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: Magnus Damm <damm@opensource.se>
Cc: Liam Girdwood <lrg@slimlogic.co.uk>
Cc: Joe Perches <joe@perches.com>
Cc: Roland Dreier <rdreier@cisco.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dma/dw_dmac.c')
| -rw-r--r-- | drivers/dma/dw_dmac.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index d28369f7afd2..8a6b85f61176 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -781,13 +781,17 @@ err_desc_get: return NULL; } -static void dwc_terminate_all(struct dma_chan *chan) +static int dwc_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd) { struct dw_dma_chan *dwc = to_dw_dma_chan(chan); struct dw_dma *dw = to_dw_dma(chan->device); struct dw_desc *desc, *_desc; LIST_HEAD(list); + /* Only supports DMA_TERMINATE_ALL */ + if (cmd != DMA_TERMINATE_ALL) + return -ENXIO; + /* * This is only called when something went wrong elsewhere, so * we don't really care about the data. Just disable the @@ -810,6 +814,8 @@ static void dwc_terminate_all(struct dma_chan *chan) /* Flush all pending and queued descriptors */ list_for_each_entry_safe(desc, _desc, &list, desc_node) dwc_descriptor_complete(dwc, desc); + + return 0; } static enum dma_status @@ -1338,7 +1344,7 @@ static int __init dw_probe(struct platform_device *pdev) dw->dma.device_prep_dma_memcpy = dwc_prep_dma_memcpy; dw->dma.device_prep_slave_sg = dwc_prep_slave_sg; - dw->dma.device_terminate_all = dwc_terminate_all; + dw->dma.device_control = dwc_control; dw->dma.device_is_tx_complete = dwc_is_tx_complete; dw->dma.device_issue_pending = dwc_issue_pending; |