audio: dai-zephyr: convert DMA src/dst addresses to host-relative add…

…resses

The DMAC has the same view of the address space as the HOST.
As such, the source and destination addresses need to be converted
to HOST-relative addresses before attempting to perform a DMA
transfer. This is only relevant for platforms for which the DSP
and HOST have different views of the address space (e.g: i.MX8ULP).

Also, if a platform doesn't define the `local_to_host` macro
(used for converting DSP local address to HOST-relative address)
we assume that the HOST and the DSP have the same view of the
address space. As such, we also add a definition of `local_to_host`
which will just return the passed address.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>

src/audio/dai-zephyr.c

@@ -41,6 +41,14 @@
 #include <zephyr/device.h>
 #include <zephyr/drivers/dai.h>
 
+/* note: if this macro is not defined
+ * then that means the HOST and the DSP
+ * have the same view of the address space.
+ */
+#ifndef local_to_host
+#define local_to_host(addr) (addr)
+#endif /* local_to_host */
+
 static const struct comp_driver comp_dai;
 
 LOG_MODULE_REGISTER(dai_comp, CONFIG_SOF_LOG_LEVEL);
@@ -751,12 +759,18 @@ static int dai_set_dma_config(struct dai_data *dd, struct comp_dev *dev)
  for (i = 0; i < dma_cfg->block_count; i++) {
  dma_block_cfg->dest_scatter_en = config->scatter;
  dma_block_cfg->block_size = config->elem_array.elems[i].size;
- dma_block_cfg->source_address = config->elem_array.elems[i].src;
- dma_block_cfg->dest_address = config->elem_array.elems[i].dest;
  if (dev->direction == SOF_IPC_STREAM_PLAYBACK) {
+ dma_block_cfg->source_address =
+ local_to_host(config->elem_array.elems[i].src);
+ dma_block_cfg->dest_address =
+ config->elem_array.elems[i].dest;
  dma_block_cfg->source_addr_adj = DMA_ADDR_ADJ_DECREMENT;
  dma_block_cfg->dest_addr_adj = DMA_ADDR_ADJ_INCREMENT;
  } else {
+ dma_block_cfg->source_address =
+ config->elem_array.elems[i].src;
+ dma_block_cfg->dest_address =
+ local_to_host(config->elem_array.elems[i].dest);
  dma_block_cfg->source_addr_adj = DMA_ADDR_ADJ_INCREMENT;
  dma_block_cfg->dest_addr_adj = DMA_ADDR_ADJ_DECREMENT;
  }