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>
diff --git a/drivers/dma/timb_dma.c b/drivers/dma/timb_dma.c
index 145f1c2..7c06471 100644
--- a/drivers/dma/timb_dma.c
+++ b/drivers/dma/timb_dma.c
@@ -613,7 +613,7 @@
return &td_desc->txd;
}
-static void td_terminate_all(struct dma_chan *chan)
+static int td_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd)
{
struct timb_dma_chan *td_chan =
container_of(chan, struct timb_dma_chan, chan);
@@ -621,6 +621,9 @@
dev_dbg(chan2dev(chan), "%s: Entry\n", __func__);
+ if (cmd != DMA_TERMINATE_ALL)
+ return -ENXIO;
+
/* first the easy part, put the queue into the free list */
spin_lock_bh(&td_chan->lock);
list_for_each_entry_safe(td_desc, _td_desc, &td_chan->queue,
@@ -630,6 +633,8 @@
/* now tear down the runnning */
__td_finish(td_chan);
spin_unlock_bh(&td_chan->lock);
+
+ return 0;
}
static void td_tasklet(unsigned long data)
@@ -743,7 +748,7 @@
dma_cap_set(DMA_SLAVE, td->dma.cap_mask);
dma_cap_set(DMA_PRIVATE, td->dma.cap_mask);
td->dma.device_prep_slave_sg = td_prep_slave_sg;
- td->dma.device_terminate_all = td_terminate_all;
+ td->dma.device_control = td_control;
td->dma.dev = &pdev->dev;