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.sricha...@ti.com> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/