From patchwork Wed Aug 14 16:19:48 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Mack X-Patchwork-Id: 2844662 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 85728BF546 for ; Wed, 14 Aug 2013 16:20:33 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A4097205B0 for ; Wed, 14 Aug 2013 16:20:28 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 0FF7A20168 for ; Wed, 14 Aug 2013 16:20:27 +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 1V9do6-0000Dy-UJ; Wed, 14 Aug 2013 16:20:23 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1V9do4-0006JP-QM; Wed, 14 Aug 2013 16:20:20 +0000 Received: from svenfoo.org ([82.94.215.22] helo=mail.zonque.de) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1V9do1-0006Hh-C7 for linux-arm-kernel@lists.infradead.org; Wed, 14 Aug 2013 16:20:18 +0000 Received: from localhost (localhost [127.0.0.1]) by mail.zonque.de (Postfix) with ESMTP id 0FE8FC1601; Wed, 14 Aug 2013 18:19:54 +0200 (CEST) Received: from mail.zonque.de ([127.0.0.1]) by localhost (rambrand.bugwerft.de [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Oiqkukkg6sAY; Wed, 14 Aug 2013 18:19:53 +0200 (CEST) Received: from tamtam.fritz.box (p5DDC6E31.dip0.t-ipconnect.de [93.220.110.49]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.zonque.de (Postfix) with ESMTPSA id 0935FC13FE; Wed, 14 Aug 2013 18:19:52 +0200 (CEST) From: Daniel Mack To: vinod.koul@intel.com Subject: [v3 1/2] dma: mmp_pdma: add support for residue reporting Date: Wed, 14 Aug 2013 18:19:48 +0200 Message-Id: <1376497189-21298-1-git-send-email-zonque@gmail.com> X-Mailer: git-send-email 1.8.3.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20130814_122017_650776_3B71A432 X-CRM114-Status: GOOD ( 13.85 ) X-Spam-Score: -0.3 (/) Cc: wangx@marvell.com, linux@arm.linux.org.uk, nico@fluxnic.net, haojian.zhuang@gmail.com, Daniel Mack , cxie4@marvell.com, ezequiel.garcia@free-electrons.com, djbw@fb.com, eric.y.miao@gmail.com, linux-arm-kernel@lists.infradead.org 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: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-7.0 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, FREEMAIL_FROM,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 X-Virus-Scanned: ClamAV using ClamSMTP In order to report the channel's residue, we have to memorize the first dma buffer position when the channel is configured. Signed-off-by: Daniel Mack --- drivers/dma/mmp_pdma.c | 45 +++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 43 insertions(+), 2 deletions(-) diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c index 579f79a..d66340a 100644 --- a/drivers/dma/mmp_pdma.c +++ b/drivers/dma/mmp_pdma.c @@ -28,8 +28,8 @@ #define DALGN 0x00a0 #define DINT 0x00f0 #define DDADR 0x0200 -#define DSADR 0x0204 -#define DTADR 0x0208 +#define DSADR(n) (0x0204 + ((n) << 4)) +#define DTADR(n) (0x0208 + ((n) << 4)) #define DCMD 0x020c #define DCSR_RUN (1 << 31) /* Run Bit (read / write) */ @@ -97,6 +97,11 @@ struct mmp_pdma_chan { struct dma_async_tx_descriptor desc; struct mmp_pdma_phy *phy; enum dma_transfer_direction dir; + /* + * We memorize the original total length so we can later determine the + * channel's residue. + */ + u32 total_len; /* channel's basic info */ struct tasklet_struct tasklet; @@ -470,6 +475,8 @@ mmp_pdma_prep_memcpy(struct dma_chan *dchan, chan->dcmd |= DCMD_BURST32; } + chan->total_len = len; + do { /* Allocate the link descriptor from DMA pool */ new = mmp_pdma_alloc_descriptor(chan); @@ -541,11 +548,14 @@ mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl, return NULL; chan->byte_align = false; + chan->total_len = 0; for_each_sg(sgl, sg, sg_len, i) { addr = sg_dma_address(sg); avail = sg_dma_len(sgl); + chan->total_len += avail; + do { len = min_t(size_t, avail, PDMA_MAX_DESC_BYTES); if (addr & 0x7) @@ -666,6 +676,36 @@ static int mmp_pdma_control(struct dma_chan *dchan, enum dma_ctrl_cmd cmd, return ret; } +static unsigned int mmp_pdma_residue(struct mmp_pdma_chan *chan) +{ + struct mmp_pdma_desc_sw *sw; + u32 curr, done = 0; + + if (chan->dir == DMA_DEV_TO_MEM) + curr = readl(chan->phy->base + DTADR(chan->phy->idx)); + else + curr = readl(chan->phy->base + DSADR(chan->phy->idx)); + + list_for_each_entry(sw, &chan->chain_running, node) { + u32 start; + u32 len = sw->desc.dcmd & DCMD_LENGTH; + + if (chan->dir == DMA_DEV_TO_MEM) + start = sw->desc.dtadr; + else + start = sw->desc.dsadr; + + if (curr >= start && curr <= (start + len)) { + done += curr - start; + break; + } + + done += len; + } + + return chan->total_len - done; +} + static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan, dma_cookie_t cookie, struct dma_tx_state *txstate) { @@ -675,6 +715,7 @@ static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan, spin_lock_irqsave(&chan->desc_lock, flags); ret = dma_cookie_status(dchan, cookie, txstate); + txstate->residue = mmp_pdma_residue(chan); spin_unlock_irqrestore(&chan->desc_lock, flags); return ret;