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>

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/dma/timb_dma.c b/drivers/dma/timb_dma.c
index 145f1c23408f..7c06471ef863 100644
--- a/drivers/dma/timb_dma.c
+++ b/drivers/dma/timb_dma.c
@@ -613,7 +613,7 @@ static struct dma_async_tx_descriptor *td_prep_slave_sg(struct dma_chan *chan,
         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 @@ static void td_terminate_all(struct dma_chan *chan)
 
         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 @@ static void td_terminate_all(struct dma_chan *chan)
         /* 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 @@ static int __devinit td_probe(struct platform_device *pdev)
         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;