Allow option for mapping SRAM as executable. DT node can specify
"memory-exec" and "memory-exec-nocache" to also map it as non-cached.
This is useful for platforms using the sram driver that need to run
PM code from sram like several ARM platforms.
Signed-off-by: Russ Dill <Russ.Dill@xxxxxx>
Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx>
---
Documentation/devicetree/bindings/sram/sram.txt | 2 ++
drivers/misc/sram.c | 8 ++++++++
2 files changed, 10 insertions(+)
diff --git a/Documentation/devicetree/bindings/sram/sram.txt b/Documentation/devicetree/bindings/sram/sram.txt
index 227e3a341af1..1f1d0aa52703 100644
--- a/Documentation/devicetree/bindings/sram/sram.txt
+++ b/Documentation/devicetree/bindings/sram/sram.txt
@@ -29,6 +29,8 @@ Optional properties in the sram node:
- no-memory-wc : the flag indicating, that SRAM memory region has not to
be remapped as write combining. WC is used by default.
+- memory-exec : map range to allow code execution
+- memory-exec-nocache : map range to allow code execution and also non-cached
Required properties in the area nodes:
diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 69cdabea9c03..7f00ba574a83 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -362,6 +362,14 @@ static int sram_probe(struct platform_device *pdev)
if (of_property_read_bool(pdev->dev.of_node, "no-memory-wc"))
sram->virt_base = devm_ioremap(sram->dev, res->start, size);
+ else if (of_property_read_bool(pdev->dev.of_node, "memory-exec"))
+ sram->virt_base = devm_ioremap_exec(sram->dev, res->start,
+ size);
+ else if (of_property_read_bool(pdev->dev.of_node,
+ "memory-exec-nocache"))
+ sram->virt_base = devm_ioremap_exec_nocache(sram->dev,
+ res->start,
+ size);
else
sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size);
if (IS_ERR(sram->virt_base))
--
2.7.3
--
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