From mboxrd@z Thu Jan 1 00:00:00 1970 From: d-gerlach@ti.com (Dave Gerlach) Date: Mon, 9 May 2016 16:41:51 -0500 Subject: [RFC PATCH 3/3] misc: SRAM: Add option to map SRAM to allow code execution In-Reply-To: <1462830111-28172-1-git-send-email-d-gerlach@ti.com> References: <1462830111-28172-1-git-send-email-d-gerlach@ti.com> Message-ID: <1462830111-28172-4-git-send-email-d-gerlach@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Signed-off-by: Dave Gerlach --- 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