From 315491e5d6ee66838a18a8ca0c14e6ffb376e48c Mon Sep 17 00:00:00 2001 From: Suman Anna Date: Fri, 9 Jan 2015 15:21:58 -0600 Subject: 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 Cc: Linus Walleij Signed-off-by: Suman Anna [small change in the commit title and in a single comment] Signed-off-by: Ohad Ben-Cohen --- include/linux/remoteproc.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'include') 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 */ -- cgit v1.2.3-58-ga151