From patchwork Fri May 10 03:00:50 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Song, Elen" X-Patchwork-Id: 2548221 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) by patchwork1.kernel.org (Postfix) with ESMTP id D2AC73FD4E for ; Fri, 10 May 2013 03:02:31 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UadbK-0000AD-DU; Fri, 10 May 2013 03:02:30 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1UadbG-0007az-JH; Fri, 10 May 2013 03:02:26 +0000 Received: from eusmtp01.atmel.com ([212.144.249.243]) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1UadbD-0007aF-1D for linux-arm-kernel@lists.infradead.org; Fri, 10 May 2013 03:02:23 +0000 Received: from apsmtp01.atmel.com (10.168.254.31) by eusmtp01.atmel.com (10.161.101.31) with Microsoft SMTP Server id 14.2.342.3; Fri, 10 May 2013 05:01:56 +0200 Received: from shaarm01.corp.atmel.com (10.168.254.13) by apsmtp01.atmel.com (10.168.254.31) with Microsoft SMTP Server id 14.2.342.3; Fri, 10 May 2013 11:02:02 +0800 From: Elen Song To: , Subject: [PATCH 1/2 V4] DMA: AT91: Get transfer width Date: Fri, 10 May 2013 11:00:50 +0800 Message-ID: <1368154850-9354-1-git-send-email-elen.song@atmel.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130509_230223_304731_F5E24192 X-CRM114-Status: UNSURE ( 8.73 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -3.1 (---) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-3.1 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 SPF_PASS SPF: sender matches SPF record -1.2 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: linux@arm.linux.org.uk, vinod.koul@intel.com, patrice.vilchez@atmel.com, elen.song@atmel.com, nicolas.ferre@atmel.com, djbw@fb.com, plagnioj@jcrosoft.com X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org In one dma transfer, the data transfer width can be configured and it is limited by source or destination peripheral width, tx_width will save the transfer width, but for memcpy, either source or destination transfer width is taken as tx_width. Signed-off-by: Elen Song --- drivers/dma/at_hdmac.c | 3 +++ drivers/dma/at_hdmac_regs.h | 2 ++ 2 files changed, 5 insertions(+) diff --git a/drivers/dma/at_hdmac.c b/drivers/dma/at_hdmac.c index 6e13f26..a4d427e 100644 --- a/drivers/dma/at_hdmac.c +++ b/drivers/dma/at_hdmac.c @@ -613,6 +613,7 @@ atc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, /* First descriptor of the chain embedds additional information */ first->txd.cookie = -EBUSY; first->len = len; + first->tx_width = src_width; /* set end-of-link to the last link descriptor of list*/ set_desc_eol(desc); @@ -759,6 +760,7 @@ atc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, /* First descriptor of the chain embedds additional information */ first->txd.cookie = -EBUSY; first->len = total_len; + first->tx_width = reg_width; /* first link descriptor of list is responsible of flags */ first->txd.flags = flags; /* client is in control of this ack */ @@ -917,6 +919,7 @@ atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, /* First descriptor of the chain embedds additional information */ first->txd.cookie = -EBUSY; first->len = buf_len; + first->tx_width = reg_width; return &first->txd; diff --git a/drivers/dma/at_hdmac_regs.h b/drivers/dma/at_hdmac_regs.h index 0eb3c13..d27942f 100644 --- a/drivers/dma/at_hdmac_regs.h +++ b/drivers/dma/at_hdmac_regs.h @@ -182,6 +182,7 @@ struct at_lli { * @txd: support for the async_tx api * @desc_node: node on the channed descriptors list * @len: total transaction bytecount + * @tx_width: transfer width */ struct at_desc { /* FIRST values the hardware uses */ @@ -192,6 +193,7 @@ struct at_desc { struct dma_async_tx_descriptor txd; struct list_head desc_node; size_t len; + u32 tx_width; }; static inline struct at_desc *