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Subject[RFC PATCH] misc: SRAM: Add option to map SRAM to allow code execution
Date
From: Russ Dill <Russ.Dill@ti.com>

Allow option for mapping SRAM as executable. 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@ti.com>
Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
---
This patch depends on the series here [1] and can be seen in context
as a dependency for am335x suspend in this branch based on v3.18-rc6
here [2].

[1] http://lkml.iu.edu/hypermail/linux/kernel/1411.3/02782.html
[2] https://github.com/dgerlach/linux-pm/tree/rfc-pm-am335x-v3.18-rc6

Documentation/devicetree/bindings/misc/sram.txt | 1 +
drivers/misc/sram.c | 13 ++++++++++++-
include/linux/platform_data/sram.h | 8 ++++++++
3 files changed, 21 insertions(+), 1 deletion(-)
create mode 100644 include/linux/platform_data/sram.h

diff --git a/Documentation/devicetree/bindings/misc/sram.txt b/Documentation/devicetree/bindings/misc/sram.txt
index 36cbe5a..c5ecde4 100644
--- a/Documentation/devicetree/bindings/misc/sram.txt
+++ b/Documentation/devicetree/bindings/misc/sram.txt
@@ -33,6 +33,7 @@ Optional properties in the area nodes:

- compatible : standard definition, should contain a vendor specific string
in the form <vendor>,[<device>-]<usage>
+- map-exec : Map range to allow code execution

Example:

diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index 21181fa..f5822de 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -31,6 +31,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/genalloc.h>
+#include <linux/platform_data/sram.h>

#define SRAM_GRANULARITY 32

@@ -56,6 +57,7 @@ static int sram_reserve_cmp(void *priv, struct list_head *a,

static int sram_probe(struct platform_device *pdev)
{
+ struct sram_platform_data *pdata = pdev->dev.platform_data;
void __iomem *virt_base;
struct sram_dev *sram;
struct resource *res;
@@ -64,12 +66,21 @@ static int sram_probe(struct platform_device *pdev)
struct sram_reserve *rblocks, *block;
struct list_head reserve_list;
unsigned int nblocks;
+ bool map_exec = false;
int ret;

INIT_LIST_HEAD(&reserve_list);

+ if (of_get_property(pdev->dev.of_node, "map-exec", NULL))
+ map_exec = true;
+ if (pdata && pdata->map_exec)
+ map_exec |= true;
+
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- virt_base = devm_ioremap_resource(&pdev->dev, res);
+ if (map_exec)
+ virt_base = devm_ioremap_exec_resource(&pdev->dev, res);
+ else
+ virt_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(virt_base))
return PTR_ERR(virt_base);

diff --git a/include/linux/platform_data/sram.h b/include/linux/platform_data/sram.h
new file mode 100644
index 0000000..8f5c4ba
--- /dev/null
+++ b/include/linux/platform_data/sram.h
@@ -0,0 +1,8 @@
+#ifndef _LINUX_SRAM_H
+#define _LINUX_SRAM_H
+
+struct sram_platform_data {
+ bool map_exec;
+};
+
+#endif
--
2.1.0


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