remoteproc: add a rproc ops for performing address translation

The rproc_da_to_va API is currently used to perform any device to
kernel address translations to meet the different needs of the remoteproc
core/drivers (eg: loading). The functionality is achieved within the
remoteproc core, and is limited only for carveouts allocated within the
core.

A new rproc ops, da_to_va, is added to provide flexibility to platform
implementations to perform the address translation themselves when the
above conditions cannot be met by the implementations. The rproc_da_to_va()
API is extended to invoke this ops if present, and fallback to regular
processing if the platform implementation cannot provide the translation.
This will allow any remoteproc implementations to translate addresses for
dedicated memories like internal memories.

While at this, also update the rproc_da_to_va() documentation since it
is an exported function.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 56739e5df1e6..9c4e1384f636 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -330,11 +330,13 @@ struct rproc;
  * @start:      power on the device and boot it
  * @stop:       power off the device
  * @kick:       kick a virtqueue (virtqueue id given as a parameter)
+ * @da_to_va:   optional platform hook to perform address translations
  */
 struct rproc_ops {
         int (*start)(struct rproc *rproc);
         int (*stop)(struct rproc *rproc);
         void (*kick)(struct rproc *rproc, int vqid);
+        void * (*da_to_va)(struct rproc *rproc, u64 da, int len);
 };
 
 /**