From patchwork Thu Oct 27 18:56:12 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Gerlach X-Patchwork-Id: 9400217 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1E1AC6059C for ; Thu, 27 Oct 2016 18:58:25 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 05A572A380 for ; Thu, 27 Oct 2016 18:58:25 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id EE8882A384; Thu, 27 Oct 2016 18:58:24 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9BD962A381 for ; Thu, 27 Oct 2016 18:58:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S941636AbcJ0S6G (ORCPT ); Thu, 27 Oct 2016 14:58:06 -0400 Received: from arroyo.ext.ti.com ([198.47.19.12]:43271 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964886AbcJ0S5p (ORCPT ); Thu, 27 Oct 2016 14:57:45 -0400 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by arroyo.ext.ti.com (8.13.7/8.13.7) with ESMTP id u9RIuxjH013805; Thu, 27 Oct 2016 13:56:59 -0500 Received: from DFLE73.ent.ti.com (dfle73.ent.ti.com [128.247.5.110]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id u9RIuxC9023235; Thu, 27 Oct 2016 13:56:59 -0500 Received: from dlep33.itg.ti.com (157.170.170.75) by DFLE73.ent.ti.com (128.247.5.110) with Microsoft SMTP Server id 14.3.294.0; Thu, 27 Oct 2016 13:56:59 -0500 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id u9RIuxi6021118; Thu, 27 Oct 2016 13:56:59 -0500 Received: from localhost (uda0274052.am.dhcp.ti.com [128.247.83.19]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id u9RIuw327519; Thu, 27 Oct 2016 13:56:58 -0500 (CDT) From: Dave Gerlach To: Arnd Bergmann , Russell King , Dan Williams CC: , , , Greg Kroah-Hartman , Shawn Guo , Tony Lindgren , Alexandre Belloni , Nishanth Menon , Dave Gerlach Subject: [PATCH 3/3] misc: SRAM: Add option to map SRAM to allow code execution Date: Thu, 27 Oct 2016 13:56:12 -0500 Message-ID: <20161027185612.22362-4-d-gerlach@ti.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20161027185612.22362-1-d-gerlach@ti.com> References: <20161027185612.22362-1-d-gerlach@ti.com> MIME-Version: 1.0 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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: Dave Gerlach --- Documentation/devicetree/bindings/sram/sram.txt | 2 ++ drivers/misc/sram.c | 7 +++++++ 2 files changed, 9 insertions(+) diff --git a/Documentation/devicetree/bindings/sram/sram.txt b/Documentation/devicetree/bindings/sram/sram.txt index add48f09015e..8eac557204e5 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 f84b53d6ce50..a9ba1be115bb 100644 --- a/drivers/misc/sram.c +++ b/drivers/misc/sram.c @@ -362,6 +362,13 @@ 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_memremap(sram->dev, res->start, size, + MEMREMAP_EXEC); + else if (of_property_read_bool(pdev->dev.of_node, + "memory-exec-nocache")) + sram->virt_base = devm_memremap(sram->dev, res->start, size, + MEMREMAP_EXEC_NOCACHE); else sram->virt_base = devm_ioremap_wc(sram->dev, res->start, size); if (!sram->virt_base)