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authorSuman Anna <s-anna@ti.com>2015-01-10 00:21:58 +0300
committerOhad Ben-Cohen <ohad@wizery.com>2015-03-12 11:43:26 +0300
commit315491e5d6ee66838a18a8ca0c14e6ffb376e48c (patch)
tree308f7c9d3cef5ff6d0cd2508714fe7406dd9718c /include/linux/remoteproc.h
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
downloadlinux-315491e5d6ee66838a18a8ca0c14e6ffb376e48c.tar.xz
remoteproc: add IOMMU hardware capability flag
The remoteproc framework currently relies on iommu_present() on the bus the device is on, to perform MMU management. However, this logic doesn't scale for multi-arch, especially for processors that do not have an IOMMU. Replace this logic instead by using a h/w capability flag for the presence of IOMMU in the rproc structure. This issue is seen on OMAP platforms when trying to add a remoteproc driver for a small Cortex M3 called the WkupM3 used for suspend / resume management on TI AM335/AM437x SoCs. This processor does not have an MMU. Same is the case with another processor subsystem PRU-ICSS on AM335/AM437x. All these are platform devices, and the current iommu_present check will not scale for the same kernel image to support OMAP4/OMAP5 and AM335/AM437x. The existing platform implementation drivers - OMAP remoteproc, STE Modem remoteproc and DA8xx remoteproc, are updated as well to properly configure the newly added rproc field. Cc: Robert Tivy <rtivy@ti.com> Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Suman Anna <s-anna@ti.com> [small change in the commit title and in a single comment] Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Diffstat (limited to 'include/linux/remoteproc.h')
-rw-r--r--include/linux/remoteproc.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 9e7e745dac55..78b8a9b9d40a 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -404,6 +404,7 @@ enum rproc_crash_type {
* @table_ptr: pointer to the resource table in effect
* @cached_table: copy of the resource table
* @table_csum: checksum of the resource table
+ * @has_iommu: flag to indicate if remote processor is behind an MMU
*/
struct rproc {
struct klist_node node;
@@ -435,6 +436,7 @@ struct rproc {
struct resource_table *table_ptr;
struct resource_table *cached_table;
u32 table_csum;
+ bool has_iommu;
};
/* we currently support only two vrings per rvdev */