Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932489AbcCHCoo (ORCPT ); Mon, 7 Mar 2016 21:44:44 -0500 Received: from smtp-4.sys.kth.se ([130.237.48.193]:38732 "EHLO smtp-4.sys.kth.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932258AbcCHCoP (ORCPT ); Mon, 7 Mar 2016 21:44:15 -0500 X-KTH-Auth: niso [89.233.230.99] X-KTH-mail-from: niklas.soderlund+renesas@ragnatech.se From: =?UTF-8?q?Niklas=20S=C3=B6derlund?= To: vinod.koul@intel.com, linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, iommu@lists.linux-foundation.org Cc: robin.murphy@arm.com, laurent.pinchart@ideasonboard.com, geert+renesas@glider.be, linus.walleij@linaro.org, dan.j.williams@intel.com, arnd@arndb.de, linux-arch@vger.kernel.org, =?UTF-8?q?Niklas=20S=C3=B6derlund?= Subject: [PATCH v5 3/9] dma-mapping: add dma_{map,unmap}_resource Date: Tue, 8 Mar 2016 03:42:48 +0100 Message-Id: <1457404974-1800-4-git-send-email-niklas.soderlund+renesas@ragnatech.se> X-Mailer: git-send-email 2.7.2 In-Reply-To: <1457404974-1800-1-git-send-email-niklas.soderlund+renesas@ragnatech.se> References: <1457404974-1800-1-git-send-email-niklas.soderlund+renesas@ragnatech.se> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1610 Lines: 53 Map/Unmap a device resource from a physical address. If no dma_map_ops method is available the operation is a no-op. Signed-off-by: Niklas Söderlund --- include/linux/dma-mapping.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index e3aba4e..cc305d1 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -216,6 +216,38 @@ static inline void dma_unmap_page(struct device *dev, dma_addr_t addr, debug_dma_unmap_page(dev, addr, size, dir, false); } +static inline dma_addr_t dma_map_resource(struct device *dev, + phys_addr_t phys_addr, + size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + unsigned long pfn = __phys_to_pfn(phys_addr); + + BUG_ON(!valid_dma_direction(dir)); + + /* Don't allow RAM to be mapped */ + BUG_ON(pfn_valid(pfn)); + + if (ops->map_resource) + return ops->map_resource(dev, phys_addr, size, dir, attrs); + + return phys_addr; +} + +static inline void dma_unmap_resource(struct device *dev, dma_addr_t addr, + size_t size, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + struct dma_map_ops *ops = get_dma_ops(dev); + + BUG_ON(!valid_dma_direction(dir)); + if (ops->unmap_resource) + ops->unmap_resource(dev, addr, size, dir, attrs); + +} + static inline void dma_sync_single_for_cpu(struct device *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) -- 2.7.2