diff options
| 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/ipu | |
| parent | 0f65169b1bf44220308e1ce1f6666ad03ddc27af (diff) | |
| download | linux-c3635c78e500a52c9fcd55de381a72928d9e054d.tar.bz2 | |
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/ipu')
| -rw-r--r-- | drivers/dma/ipu/ipu_idmac.c | 21 |
1 files changed, 15 insertions, 6 deletions
diff --git a/drivers/dma/ipu/ipu_idmac.c b/drivers/dma/ipu/ipu_idmac.c index 2a446397c884..39e7fb2a90e3 100644 --- a/drivers/dma/ipu/ipu_idmac.c +++ b/drivers/dma/ipu/ipu_idmac.c @@ -1472,13 +1472,17 @@ static void idmac_issue_pending(struct dma_chan *chan) */ } -static void __idmac_terminate_all(struct dma_chan *chan) +static int __idmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd) { struct idmac_channel *ichan = to_idmac_chan(chan); struct idmac *idmac = to_idmac(chan->device); unsigned long flags; int i; + /* Only supports DMA_TERMINATE_ALL */ + if (cmd != DMA_TERMINATE_ALL) + return -ENXIO; + ipu_disable_channel(idmac, ichan, ichan->status >= IPU_CHANNEL_ENABLED); @@ -1505,17 +1509,22 @@ static void __idmac_terminate_all(struct dma_chan *chan) tasklet_enable(&to_ipu(idmac)->tasklet); ichan->status = IPU_CHANNEL_INITIALIZED; + + return 0; } -static void idmac_terminate_all(struct dma_chan *chan) +static int idmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd) { struct idmac_channel *ichan = to_idmac_chan(chan); + int ret; mutex_lock(&ichan->chan_mutex); - __idmac_terminate_all(chan); + ret = __idmac_control(chan, cmd); mutex_unlock(&ichan->chan_mutex); + + return ret; } #ifdef DEBUG @@ -1607,7 +1616,7 @@ static void idmac_free_chan_resources(struct dma_chan *chan) mutex_lock(&ichan->chan_mutex); - __idmac_terminate_all(chan); + __idmac_control(chan, DMA_TERMINATE_ALL); if (ichan->status > IPU_CHANNEL_FREE) { #ifdef DEBUG @@ -1669,7 +1678,7 @@ static int __init ipu_idmac_init(struct ipu *ipu) /* Compulsory for DMA_SLAVE fields */ dma->device_prep_slave_sg = idmac_prep_slave_sg; - dma->device_terminate_all = idmac_terminate_all; + dma->device_control = idmac_control; INIT_LIST_HEAD(&dma->channels); for (i = 0; i < IPU_CHANNELS_NUM; i++) { @@ -1703,7 +1712,7 @@ static void __exit ipu_idmac_exit(struct ipu *ipu) for (i = 0; i < IPU_CHANNELS_NUM; i++) { struct idmac_channel *ichan = ipu->channel + i; - idmac_terminate_all(&ichan->dma_chan); + idmac_control(&ichan->dma_chan, DMA_TERMINATE_ALL); idmac_prep_slave_sg(&ichan->dma_chan, NULL, 0, DMA_NONE, 0); } |