Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965728AbcJYKut (ORCPT ); Tue, 25 Oct 2016 06:50:49 -0400 Received: from arroyo.ext.ti.com ([198.47.19.12]:51657 "EHLO arroyo.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755241AbcJYKur (ORCPT ); Tue, 25 Oct 2016 06:50:47 -0400 From: Peter Ujfalusi To: , , Tony Lindgren , Russell King - ARM Linux CC: , , , Subject: [PATCH 1/2] dmaengine: dma_slave_config: add support for slave port window Date: Tue, 25 Oct 2016 13:50:18 +0300 Message-ID: <20161025105019.24475-2-peter.ujfalusi@ti.com> X-Mailer: git-send-email 2.10.1 In-Reply-To: <20161025105019.24475-1-peter.ujfalusi@ti.com> References: <20161025105019.24475-1-peter.ujfalusi@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1579 Lines: 38 Some slave devices uses address window instead of single register for read and/or write of data. With the src/dst_port_window_size the address window can be specified and the DMAengine driver should use this information to correctly set up the transfer to loop within the provided window. Signed-off-by: Peter Ujfalusi --- include/linux/dmaengine.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index cc535a478bae..689d44327ef3 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -336,6 +336,12 @@ enum dma_slave_buswidth { * may or may not be applicable on memory sources. * @dst_maxburst: same as src_maxburst but for destination target * mutatis mutandis. + * @src_port_window_size: The length of the register area the data need to be + * written on the device side. It is only used for devices which is using an + * area instead of a single register to receive the data. Typically the DMA + * loops in this area in order to transfer the data. + * @dst_port_window_size: same as src_port_window_size but for the destination + * port. * @device_fc: Flow Controller Settings. Only valid for slave channels. Fill * with 'true' if peripheral should be flow controller. Direction will be * selected at Runtime. @@ -363,6 +369,8 @@ struct dma_slave_config { enum dma_slave_buswidth dst_addr_width; u32 src_maxburst; u32 dst_maxburst; + u32 src_port_window_size; + u32 dst_port_window_size; bool device_fc; unsigned int slave_id; }; -- 2.10.1