From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by casper.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1ewosH-0008BT-NP for barebox@lists.infradead.org; Fri, 16 Mar 2018 12:54:26 +0000 From: Sascha Hauer Subject: [PATCH 49/78] dma: Add prototypes for dma mapping functions Date: Fri, 16 Mar 2018 13:53:25 +0100 Message-Id: <20180316125354.23462-50-s.hauer@pengutronix.de> In-Reply-To: <20180316125354.23462-1-s.hauer@pengutronix.de> References: <20180316125354.23462-1-s.hauer@pengutronix.de> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org To: Barebox List Right now we only have the dma_sync_single_* functions, but no functions for actually mapping a pointer. The mapping functions become necessary when casting a pointer to unsigned long to get a dma address is not enough. (I'm not even going so far that we'll add IOMMU support, but on some architectures we need a place where we can check if a pointer is DMA mappable at all) Signed-off-by: Sascha Hauer --- include/dma.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/include/dma.h b/include/dma.h index 29d94c0a52..5fdcb1733c 100644 --- a/include/dma.h +++ b/include/dma.h @@ -30,6 +30,18 @@ static inline void dma_free(void *mem) } #endif +dma_addr_t dma_map_single(struct device_d *dev, void *ptr, size_t size, + enum dma_data_direction dir); +void dma_unmap_single(struct device_d *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir); + +#define DMA_ERROR_CODE (~(dma_addr_t)0) + +static inline int dma_mapping_error(struct device_d *dev, dma_addr_t dma_addr) +{ + return dma_addr == DMA_ERROR_CODE; +} + /* streaming DMA - implement the below calls to support HAS_DMA */ void dma_sync_single_for_cpu(dma_addr_t address, size_t size, enum dma_data_direction dir); -- 2.16.1 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox