remoteproc: add vendor resources handling

In order to allow rproc backend to handle vendor resources such as in
OpenAMP, add a handle_rsc hook. This hook allow the rproc backends to
handle vendor resources as they like. The hook will be called only for
vendor resources and should return RSC_HANDLED on successful resource
handling, RSC_IGNORED if resource was ignored, or a negative value on
error.

Signed-off-by: Clement Leger <cleger@kalray.eu>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

1 files changed, 26 insertions, 6 deletions

diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 04d04709f2bd..16ad66683ad0 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -100,7 +100,9 @@ struct fw_rsc_hdr {
  *		    the remote processor will be writing logs.
  * @RSC_VDEV:       declare support for a virtio device, and serve as its
  *		    virtio header.
- * @RSC_LAST:       just keep this one at the end
+ * @RSC_LAST:       just keep this one at the end of standard resources
+ * @RSC_VENDOR_START:	start of the vendor specific resource types range
+ * @RSC_VENDOR_END:	end of the vendor specific resource types range
  *
  * For more details regarding a specific resource type, please see its
  * dedicated structure below.
@@ -111,11 +113,13 @@ struct fw_rsc_hdr {
  * please update it as needed.
  */
 enum fw_resource_type {
-	RSC_CARVEOUT	= 0,
-	RSC_DEVMEM	= 1,
-	RSC_TRACE	= 2,
-	RSC_VDEV	= 3,
-	RSC_LAST	= 4,
+	RSC_CARVEOUT		= 0,
+	RSC_DEVMEM		= 1,
+	RSC_TRACE		= 2,
+	RSC_VDEV		= 3,
+	RSC_LAST		= 4,
+	RSC_VENDOR_START	= 128,
+	RSC_VENDOR_END		= 512,
 };
 
 #define FW_RSC_ADDR_ANY (-1)
@@ -340,12 +344,26 @@ struct rproc_mem_entry {
 struct firmware;
 
 /**
+ * enum rsc_handling_status - return status of rproc_ops handle_rsc hook
+ * @RSC_HANDLED:	resource was handled
+ * @RSC_IGNORED:	resource was ignored
+ */
+enum rsc_handling_status {
+	RSC_HANDLED	= 0,
+	RSC_IGNORED	= 1,
+};
+
+/**
  * struct rproc_ops - platform-specific device handlers
  * @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
  * @parse_fw:	parse firmware to extract information (e.g. resource table)
+ * @handle_rsc:	optional platform hook to handle vendor resources. Should return
+ * RSC_HANDLED if resource was handled, RSC_IGNORED if not handled and a
+ * negative value on error
+ * @load_rsc_table:	load resource table from firmware image
  * @find_loaded_rsc_table: find the loaded resouce table
  * @load:		load firmware to memory, where the remote processor
  *			expects to find it
@@ -358,6 +376,8 @@ struct rproc_ops {
 	void (*kick)(struct rproc *rproc, int vqid);
 	void * (*da_to_va)(struct rproc *rproc, u64 da, int len);
 	int (*parse_fw)(struct rproc *rproc, const struct firmware *fw);
+	int (*handle_rsc)(struct rproc *rproc, u32 rsc_type, void *rsc,
+			  int offset, int avail);
 	struct resource_table *(*find_loaded_rsc_table)(
 				struct rproc *rproc, const struct firmware *fw);
 	int (*load)(struct rproc *rproc, const struct firmware *fw);