From patchwork Thu Aug 28 06:57:40 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Simon Horman X-Patchwork-Id: 4801351 Return-Path: X-Original-To: patchwork-ltsi-dev@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 1D6AF9F375 for ; Thu, 28 Aug 2014 08:58:11 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2508E201B9 for ; Thu, 28 Aug 2014 08:58:10 +0000 (UTC) Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 199442015A for ; Thu, 28 Aug 2014 08:58:09 +0000 (UTC) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id AB46B17A7; Thu, 28 Aug 2014 07:38:29 +0000 (UTC) X-Original-To: ltsi-dev@lists.linuxfoundation.org Delivered-To: ltsi-dev@mail.linuxfoundation.org Received: from smtp2.linuxfoundation.org (smtp2.linux-foundation.org [172.17.192.36]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 8CF731598 for ; Thu, 28 Aug 2014 07:37:23 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.7.6 Received: from kirsty.vergenet.net (kirsty.vergenet.net [202.4.237.240]) by smtp2.linuxfoundation.org (Postfix) with ESMTP id 9FA111DB99 for ; Thu, 28 Aug 2014 07:37:22 +0000 (UTC) Received: from ayumi.isobedori.kobe.vergenet.net (p4222-ipbfp1605kobeminato.hyogo.ocn.ne.jp [114.154.95.222]) by kirsty.vergenet.net (Postfix) with ESMTP id F2AA1267295; Thu, 28 Aug 2014 17:08:13 +1000 (EST) Received: by ayumi.isobedori.kobe.vergenet.net (Postfix, from userid 7100) id 803FDEDE8E0; Thu, 28 Aug 2014 16:08:12 +0900 (JST) From: Simon Horman To: ltsi-dev@lists.linuxfoundation.org Date: Thu, 28 Aug 2014 15:57:40 +0900 Message-Id: <1409209620-24487-335-git-send-email-horms+renesas@verge.net.au> X-Mailer: git-send-email 2.0.1 In-Reply-To: <1409209620-24487-1-git-send-email-horms+renesas@verge.net.au> References: <1409209620-24487-1-git-send-email-horms+renesas@verge.net.au> X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org Cc: Magnus Damm Subject: [LTSI-dev] [PATCH LTSI-3.14 334/894] DMA: shdma: add cyclic transfer support X-BeenThere: ltsi-dev@lists.linuxfoundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: "A list to discuss patches, development, and other things related to the LTSI project" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ltsi-dev-bounces@lists.linuxfoundation.org Errors-To: ltsi-dev-bounces@lists.linuxfoundation.org X-Virus-Scanned: ClamAV using ClamSMTP From: Kuninori Morimoto This patch add cyclic transfer support and enables dmaengine_prep_dma_cyclic() Signed-off-by: Kuninori Morimoto [reflown changelog for readablity] Signed-off-by: Vinod Koul (cherry picked from commit dfbb85cab5f0819d0424a3637b03e7892704fa42) Signed-off-by: Simon Horman --- drivers/dma/sh/shdma-base.c | 72 ++++++++++++++++++++++++++++++++++++++++----- include/linux/shdma-base.h | 1 + 2 files changed, 66 insertions(+), 7 deletions(-) diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c index 5239677..a26ded2 100644 --- a/drivers/dma/sh/shdma-base.c +++ b/drivers/dma/sh/shdma-base.c @@ -304,6 +304,7 @@ static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all) dma_async_tx_callback callback = NULL; void *param = NULL; unsigned long flags; + LIST_HEAD(cyclic_list); spin_lock_irqsave(&schan->chan_lock, flags); list_for_each_entry_safe(desc, _desc, &schan->ld_queue, node) { @@ -369,10 +370,16 @@ static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all) if (((desc->mark == DESC_COMPLETED || desc->mark == DESC_WAITING) && async_tx_test_ack(&desc->async_tx)) || all) { - /* Remove from ld_queue list */ - desc->mark = DESC_IDLE; - list_move(&desc->node, &schan->ld_free); + if (all || !desc->cyclic) { + /* Remove from ld_queue list */ + desc->mark = DESC_IDLE; + list_move(&desc->node, &schan->ld_free); + } else { + /* reuse as cyclic */ + desc->mark = DESC_SUBMITTED; + list_move_tail(&desc->node, &cyclic_list); + } if (list_empty(&schan->ld_queue)) { dev_dbg(schan->dev, "Bring down channel %d\n", schan->id); @@ -389,6 +396,8 @@ static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all) */ schan->dma_chan.completed_cookie = schan->dma_chan.cookie; + list_splice_tail(&cyclic_list, &schan->ld_queue); + spin_unlock_irqrestore(&schan->chan_lock, flags); if (callback) @@ -521,7 +530,7 @@ static struct shdma_desc *shdma_add_desc(struct shdma_chan *schan, */ static struct dma_async_tx_descriptor *shdma_prep_sg(struct shdma_chan *schan, struct scatterlist *sgl, unsigned int sg_len, dma_addr_t *addr, - enum dma_transfer_direction direction, unsigned long flags) + enum dma_transfer_direction direction, unsigned long flags, bool cyclic) { struct scatterlist *sg; struct shdma_desc *first = NULL, *new = NULL /* compiler... */; @@ -569,7 +578,11 @@ static struct dma_async_tx_descriptor *shdma_prep_sg(struct shdma_chan *schan, if (!new) goto err_get_desc; - new->chunks = chunks--; + new->cyclic = cyclic; + if (cyclic) + new->chunks = 1; + else + new->chunks = chunks--; list_add_tail(&new->node, &tx_list); } while (len); } @@ -612,7 +625,8 @@ static struct dma_async_tx_descriptor *shdma_prep_memcpy( sg_dma_address(&sg) = dma_src; sg_dma_len(&sg) = len; - return shdma_prep_sg(schan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM, flags); + return shdma_prep_sg(schan, &sg, 1, &dma_dest, DMA_MEM_TO_MEM, + flags, false); } static struct dma_async_tx_descriptor *shdma_prep_slave_sg( @@ -640,7 +654,50 @@ static struct dma_async_tx_descriptor *shdma_prep_slave_sg( slave_addr = ops->slave_addr(schan); return shdma_prep_sg(schan, sgl, sg_len, &slave_addr, - direction, flags); + direction, flags, false); +} + +struct dma_async_tx_descriptor *shdma_prep_dma_cyclic( + struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, + size_t period_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct shdma_chan *schan = to_shdma_chan(chan); + struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device); + const struct shdma_ops *ops = sdev->ops; + unsigned int sg_len = buf_len / period_len; + int slave_id = schan->slave_id; + dma_addr_t slave_addr; + struct scatterlist sgl[sg_len]; + int i; + + if (!chan) + return NULL; + + BUG_ON(!schan->desc_num); + + /* Someone calling slave DMA on a generic channel? */ + if (slave_id < 0 || (buf_len < period_len)) { + dev_warn(schan->dev, + "%s: bad parameter: buf_len=%d, period_len=%d, id=%d\n", + __func__, buf_len, period_len, slave_id); + return NULL; + } + + slave_addr = ops->slave_addr(schan); + + sg_init_table(sgl, sg_len); + for (i = 0; i < sg_len; i++) { + dma_addr_t src = buf_addr + (period_len * i); + + sg_set_page(&sgl[i], pfn_to_page(PFN_DOWN(src)), period_len, + offset_in_page(src)); + sg_dma_address(&sgl[i]) = src; + sg_dma_len(&sgl[i]) = period_len; + } + + return shdma_prep_sg(schan, sgl, sg_len, &slave_addr, + direction, flags, true); } static int shdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, @@ -915,6 +972,7 @@ int shdma_init(struct device *dev, struct shdma_dev *sdev, /* Compulsory for DMA_SLAVE fields */ dma_dev->device_prep_slave_sg = shdma_prep_slave_sg; + dma_dev->device_prep_dma_cyclic = shdma_prep_dma_cyclic; dma_dev->device_control = shdma_control; dma_dev->dev = dev; diff --git a/include/linux/shdma-base.h b/include/linux/shdma-base.h index f92c0a4..abdf1f2 100644 --- a/include/linux/shdma-base.h +++ b/include/linux/shdma-base.h @@ -54,6 +54,7 @@ struct shdma_desc { dma_cookie_t cookie; int chunks; int mark; + bool cyclic; /* used as cyclic transfer */ }; struct shdma_chan {