From: Russ Dill <Russ.Dill@xxxxxx> 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@xxxxxx> Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
