dmaengine: ti-dma-crossbar: Add support for eDMA
The crossbar for eDMA works exactly the same way as sDMA, but sDMA
requires an offset of 1, while no offset is needed for eDMA.
Based on the patch from Misael Lopez Cruz <misael.lopez@ti.com>
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
CC: Misael Lopez Cruz <misael.lopez@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c
index 1fd3fb7..10487d9 100644
--- a/drivers/dma/ti-dma-crossbar.c
+++ b/drivers/dma/ti-dma-crossbar.c
@@ -20,6 +20,9 @@
#define TI_XBAR_OUTPUTS 127
#define TI_XBAR_INPUTS 256
+#define TI_XBAR_EDMA_OFFSET 0
+#define TI_XBAR_SDMA_OFFSET 1
+
struct ti_dma_xbar_data {
void __iomem *iomem;
@@ -29,6 +32,7 @@
u16 safe_val; /* Value to rest the crossbar lines */
u32 xbar_requests; /* number of DMA requests connected to XBAR */
u32 dma_requests; /* number of DMA requests forwarded to DMA */
+ u32 dma_offset;
};
struct ti_dma_xbar_map {
@@ -84,8 +88,7 @@
GFP_KERNEL);
map->xbar_in = (u16)dma_spec->args[0];
- /* The DMA request is 1 based in sDMA */
- dma_spec->args[0] = map->xbar_out + 1;
+ dma_spec->args[0] = map->xbar_out + xbar->dma_offset;
dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
map->xbar_in, map->xbar_out);
@@ -95,9 +98,22 @@
return map;
}
+static const struct of_device_id ti_dma_master_match[] = {
+ {
+ .compatible = "ti,omap4430-sdma",
+ .data = (void *)TI_XBAR_SDMA_OFFSET,
+ },
+ {
+ .compatible = "ti,edma3",
+ .data = (void *)TI_XBAR_EDMA_OFFSET,
+ },
+ {},
+};
+
static int ti_dma_xbar_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
+ const struct of_device_id *match;
struct device_node *dma_node;
struct ti_dma_xbar_data *xbar;
struct resource *res;
@@ -120,6 +136,12 @@
return -ENODEV;
}
+ match = of_match_node(ti_dma_master_match, dma_node);
+ if (!match) {
+ dev_err(&pdev->dev, "DMA master is not supported\n");
+ return -EINVAL;
+ }
+
if (of_property_read_u32(dma_node, "dma-requests",
&xbar->dma_requests)) {
dev_info(&pdev->dev,
@@ -151,6 +173,7 @@
xbar->dmarouter.dev = &pdev->dev;
xbar->dmarouter.route_free = ti_dma_xbar_free;
+ xbar->dma_offset = (u32)match->data;
platform_set_drvdata(pdev, xbar);