Changeset 298 for soft/giet_vm/giet_drivers/dma_driver.c

Timestamp:

Apr 3, 2014, 2:00:10 PM (10 years ago)

Author:

alain

Message:

Introducing pic driver and rdk driver

File:

• soft/giet_vm/giet_drivers/dma_driver.c (modified) (2 diffs)

soft/giet_vm/giet_drivers/dma_driver.c

@@ -174 +174 @@
 }
 ///////////////////////////////////////////////////////////////////////////////////
-// This function copies a source memory buffer to a destnation memory buffer, 
+// This function copies a source memory buffer to a destination memory buffer, 
 // using the distributed DMA. As it makes virtual to physical address translation, 
-// the MMU should be activated. As there is one DMA channel per processor, 
+// the MMU should be activated. 
+// This driver makes the assumption that each processor has a private DMA channel: 
 // the DMA cluster and channel indexes are obtained from the processor index.
 // The source and destination buffers base addresses must be word aligned, 
@@ -196 +197 @@
     unsigned int procid    = _get_procid();
     unsigned int cluster_xy = procid/NB_PROCS_MAX;
-    unsigned int x          = cluster_xy >> Y_WIDTH;
-    unsigned int y          = cluster_xy & ((1<<Y_WIDTH)-1);
     unsigned int channel_id = procid%NB_PROCS_MAX;