dma: Introduce dma_get_cfg() interface
Sometimes, there would be a need to exchange data between DMA provider
and DMA client which are very specific to DMA driver of the SoC/platform
and are not generic enough to be put into struct dma. Therefore, introduce
dma_get_cfg() interface to get DMA provider specific data from client
device. Clients can use unique configuration ID flags to get different
configuration data from DMA driver.
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
diff --git a/drivers/dma/dma-uclass.c b/drivers/dma/dma-uclass.c
index 0ff56f7..5598bca 100644
--- a/drivers/dma/dma-uclass.c
+++ b/drivers/dma/dma-uclass.c
@@ -187,6 +187,18 @@
return ops->send(dma, src, len, metadata);
}
+
+int dma_get_cfg(struct dma *dma, u32 cfg_id, void **cfg_data)
+{
+ struct dma_ops *ops = dma_dev_ops(dma->dev);
+
+ debug("%s(dma=%p)\n", __func__, dma);
+
+ if (!ops->get_cfg)
+ return -ENOSYS;
+
+ return ops->get_cfg(dma, cfg_id, cfg_data);
+}
#endif /* CONFIG_DMA_CHANNELS */
int dma_get_device(u32 transfer_type, struct udevice **devp)
diff --git a/include/dma-uclass.h b/include/dma-uclass.h
index 31b43fb..a1d9d26 100644
--- a/include/dma-uclass.h
+++ b/include/dma-uclass.h
@@ -108,6 +108,17 @@
* @return zero on success, or -ve error code.
*/
int (*send)(struct dma *dma, void *src, size_t len, void *metadata);
+ /**
+ * get_cfg() - Get DMA channel configuration for client's use
+ *
+ * @dma: The DMA Channel to manipulate
+ * @cfg_id: DMA provider specific ID to identify what
+ * configuration data client needs
+ * @data: Pointer to store pointer to DMA driver specific
+ * configuration data for the given cfg_id (output param)
+ * @return zero on success, or -ve error code.
+ */
+ int (*get_cfg)(struct dma *dma, u32 cfg_id, void **data);
#endif /* CONFIG_DMA_CHANNELS */
/**
* transfer() - Issue a DMA transfer. The implementation must
diff --git a/include/dma.h b/include/dma.h
index d1c3d0d..6c55aa3 100644
--- a/include/dma.h
+++ b/include/dma.h
@@ -290,6 +290,18 @@
* @return zero on success, or -ve error code.
*/
int dma_send(struct dma *dma, void *src, size_t len, void *metadata);
+
+/**
+ * dma_get_cfg() - Get DMA channel configuration for client's use
+ *
+ * @dma: The DMA Channel to manipulate
+ * @cfg_id: DMA provider specific ID to identify what
+ * configuration data client needs
+ * @cfg_data: Pointer to store pointer to DMA driver specific
+ * configuration data for the given cfg_id (output param)
+ * @return zero on success, or -ve error code.
+ */
+int dma_get_cfg(struct dma *dma, u32 cfg_id, void **cfg_data);
#endif /* CONFIG_DMA_CHANNELS */
/*