From 6e701bfc17f52d4a36802976ad6baa5ae8b4639d Mon Sep 17 00:00:00 2001 From: Russ Dill Date: Tue, 17 Sep 2013 02:34:58 -0700 Subject: [PATCH] misc: SRAM: Add option to map SRAM to allow code execution This is necessary for platforms that use SRAM to execute suspend/resume stubs. Signed-off-by: Russ Dill --- Documentation/devicetree/bindings/misc/sram.txt | 4 ++++ drivers/misc/sram.c | 13 ++++++++++++- include/linux/platform_data/sram.h | 8 ++++++++ 3 files changed, 24 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 4d0a00e453a8..4fa9af31a061 100644 --- a/Documentation/devicetree/bindings/misc/sram.txt +++ b/Documentation/devicetree/bindings/misc/sram.txt @@ -8,6 +8,10 @@ Required properties: - reg : SRAM iomem address range +Optional properties: + +- map-exec: Map range to allow code execution + Example: sram: sram@5c000000 { diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c index d87cc91bc016..baa50080ac46 100644 --- a/drivers/misc/sram.c +++ b/drivers/misc/sram.c @@ -28,6 +28,7 @@ #include #include #include +#include #define SRAM_GRANULARITY 32 @@ -38,14 +39,24 @@ struct sram_dev { 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; unsigned long size; + bool map_exec = false; int ret; + 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 000000000000..8f5c4bab1860 --- /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 -- 2.34.1