Each dma-request channel can be connected to the dma-controller either
directly or through a crossbar router. In such cases request lines
should be routed to the dma-controller. Adding a xlate function
which would retrieve and store the router data associated with a particular
channel in the dma-channel specific structure. This is used to map/unmap
the dma request lines.
Signed-off-by: Sricharan R <r.sricharan@xxxxxx>
---
drivers/dma/omap-dma.c | 47 ++++++++++++++++++++++++++++++++++++++++++++---
1 file changed, 44 insertions(+), 3 deletions(-)
diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index a0d6639..38407f9 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -44,6 +44,8 @@ struct omap_chan {
uint32_t ccr;
struct dma_slave_config cfg;
+ struct dma_xbar_device *router;
+
unsigned dma_sig;
bool cyclic;
bool paused;
@@ -75,6 +77,11 @@ struct omap_desc {
struct omap_sg sg[0];
};
+struct omap_dma_filter_args {
+ void *router_data;
+ unsigned chan;
+};
+
enum {
CCR_FS = BIT(5),
CCR_READ_PRIORITY = BIT(6),
@@ -586,6 +593,7 @@ static void omap_dma_free_chan_resources(struct dma_chan *chan)
c->channel_base = NULL;
od->lch_map[c->dma_ch] = NULL;
vchan_free_chan_resources(&c->vc);
+
omap_free_dma(c->dma_ch);
dev_dbg(od->ddev.dev, "freeing channel for %u\n", c->dma_sig);
@@ -1088,6 +1096,34 @@ static void omap_dma_free(struct omap_dmadev *od)
}
}
+static struct dma_chan *of_omap_dma_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ int count = dma_spec->args_count;
+ struct of_dma_filter_info *info = ofdma->of_dma_data;
+ struct omap_dma_filter_args args;
+ struct dma_xbar_device *c = NULL;
+
+ if (!info || !info->filter_fn)
+ return NULL;
+
+ if ((count != 1) && (count != 2))
+ return NULL;
+
+ args.chan = dma_spec->args[0];
+ args.router_data = NULL;
+
+ if (count == 2) {
+ c = of_dma_get_router_data(dma_spec->args[1]);
+
+ if (c && c->ops && c->ops->map && c->ops->unmap)
+ args.router_data = c;
+ }
+
+ return dma_request_channel(info->dma_cap, info->filter_fn,
+ &args);
+}
+
static int omap_dma_probe(struct platform_device *pdev)
{
struct omap_dmadev *od;
@@ -1167,7 +1203,7 @@ static int omap_dma_probe(struct platform_device *pdev)
/* Device-tree DMA controller registration */
rc = of_dma_controller_register(pdev->dev.of_node,
- of_dma_simple_xlate, &omap_dma_info);
+ of_omap_dma_xlate, &omap_dma_info);
if (rc) {
pr_warn("OMAP-DMA: failed to register DMA controller\n");
dma_async_device_unregister(&od->ddev);
@@ -1221,11 +1257,16 @@ static struct platform_driver omap_dma_driver = {
bool omap_dma_filter_fn(struct dma_chan *chan, void *param)
{
+ struct omap_dma_filter_args *args = param;
+
if (chan->device->dev->driver == &omap_dma_driver.driver) {
struct omap_chan *c = to_omap_dma_chan(chan);
- unsigned req = *(unsigned *)param;
+ unsigned req = args->chan;
- return req == c->dma_sig;
+ if (req == c->dma_sig) {
+ c->router = args->router_data;
+ return true;
+ }
}
return false;
}
--
1.7.9.5
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