From patchwork Mon Sep 12 18:29:21 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: thomas.abraham@linaro.org X-Patchwork-Id: 4030 Return-Path: X-Original-To: patchwork@peony.canonical.com Delivered-To: patchwork@peony.canonical.com Received: from fiordland.canonical.com (fiordland.canonical.com [91.189.94.145]) by peony.canonical.com (Postfix) with ESMTP id 52D4A23EF7 for ; Mon, 12 Sep 2011 18:30:14 +0000 (UTC) Received: from mail-fx0-f52.google.com (mail-fx0-f52.google.com [209.85.161.52]) by fiordland.canonical.com (Postfix) with ESMTP id 43421A1843E for ; Mon, 12 Sep 2011 18:30:14 +0000 (UTC) Received: by mail-fx0-f52.google.com with SMTP id 23so2209234fxe.11 for ; Mon, 12 Sep 2011 11:30:14 -0700 (PDT) Received: by 10.223.34.143 with SMTP id l15mr40618fad.46.1315852214117; Mon, 12 Sep 2011 11:30:14 -0700 (PDT) X-Forwarded-To: linaro-patchwork@canonical.com X-Forwarded-For: patch@linaro.org linaro-patchwork@canonical.com Delivered-To: patches@linaro.org Received: by 10.152.11.8 with SMTP id m8cs9562lab; Mon, 12 Sep 2011 11:30:13 -0700 (PDT) Received: by 10.236.72.169 with SMTP id t29mr28320386yhd.110.1315852208163; Mon, 12 Sep 2011 11:30:08 -0700 (PDT) Received: from mailout4.samsung.com (mailout4.samsung.com [203.254.224.34]) by mx.google.com with ESMTP id f15si2041916ybn.108.2011.09.12.11.30.06; Mon, 12 Sep 2011 11:30:08 -0700 (PDT) Received-SPF: neutral (google.com: 203.254.224.34 is neither permitted nor denied by best guess record for domain of thomas.abraham@linaro.org) client-ip=203.254.224.34; Authentication-Results: mx.google.com; spf=neutral (google.com: 203.254.224.34 is neither permitted nor denied by best guess record for domain of thomas.abraham@linaro.org) smtp.mail=thomas.abraham@linaro.org Received: from epcpsbgm2.samsung.com (mailout4.samsung.com [203.254.224.34]) by mailout4.samsung.com (Oracle Communications Messaging Exchange Server 7u4-19.01 64bit (built Sep 7 2010)) with ESMTP id <0LRF00ER9A20FFD0@mailout4.samsung.com> for patches@linaro.org; Tue, 13 Sep 2011 03:30:05 +0900 (KST) X-AuditID: cbfee61b-b7b7fae000005864-07-4e6e4fad8b38 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2.samsung.com (MMPCPMTA) with SMTP id B7.56.22628.DAF4E6E4; Tue, 13 Sep 2011 03:30:05 +0900 (KST) Received: from localhost.localdomain ([107.108.73.37]) by mmp1.samsung.com (Oracle Communications Messaging Exchange Server 7u4-19.01 64bit (built Sep 7 2010)) with ESMTPA id <0LRF00IKLA1VQ250@mmp1.samsung.com> for patches@linaro.org; Tue, 13 Sep 2011 03:30:05 +0900 (KST) From: Thomas Abraham To: devicetree-discuss@lists.ozlabs.org Cc: grant.likely@secretlab.ca, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, kgene.kim@samsung.com, robherring2@gmail.com, vinod.koul@intel.com, patches@linaro.org, jassisinghbrar@gmail.com, boojin.kim@samsung.com Subject: [PATCH v3 2/6] DMA: PL330: Infer transfer direction from transfer request instead of platform data Date: Mon, 12 Sep 2011 23:59:21 +0530 Message-id: <1315852165-32402-3-git-send-email-thomas.abraham@linaro.org> X-Mailer: git-send-email 1.6.6.rc2 In-reply-to: <1315852165-32402-2-git-send-email-thomas.abraham@linaro.org> References: <1315852165-32402-1-git-send-email-thomas.abraham@linaro.org> <1315852165-32402-2-git-send-email-thomas.abraham@linaro.org> X-Brightmail-Tracker: AAAAAA== The transfer direction for a channel can be inferred from the transfer request and the need for specifying transfer direction in platfrom data can be eliminated. So the structure definition 'struct dma_pl330_peri' is no longer required. The channel's private data is set to point to a channel id specified in the platform data (instead of an instance of type 'struct dma_pl330_peri'). The filter function is correspondingly modified to match the channel id. With the 'struct dma_pl330_peri' removed from platform data, the dma controller transfer capabilities cannot be inferred any more. Hence, the dma controller capabilities is specified using platform data. Cc: Jassi Brar Cc: Boojin Kim Signed-off-by: Thomas Abraham Acked-by: Jassi Brar --- drivers/dma/pl330.c | 65 +++++++++++--------------------------------- include/linux/amba/pl330.h | 13 ++------- 2 files changed, 19 insertions(+), 59 deletions(-) diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 5f1d24c..992bf82 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -272,13 +272,13 @@ static void dma_pl330_rqcb(void *token, enum pl330_op_err err) bool pl330_filter(struct dma_chan *chan, void *param) { - struct dma_pl330_peri *peri; + u8 *peri_id; if (chan->device->dev->driver != &pl330_driver.drv) return false; - peri = chan->private; - return peri->peri_id == (unsigned)param; + peri_id = chan->private; + return *peri_id == (unsigned)param; } EXPORT_SYMBOL(pl330_filter); @@ -512,7 +512,7 @@ pluck_desc(struct dma_pl330_dmac *pdmac) static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch) { struct dma_pl330_dmac *pdmac = pch->dmac; - struct dma_pl330_peri *peri = pch->chan.private; + u8 *peri_id = pch->chan.private; struct dma_pl330_desc *desc; /* Pluck one desc from the pool of DMAC */ @@ -537,13 +537,7 @@ static struct dma_pl330_desc *pl330_get_desc(struct dma_pl330_chan *pch) desc->txd.cookie = 0; async_tx_ack(&desc->txd); - if (peri) { - desc->req.rqtype = peri->rqtype; - desc->req.peri = pch->chan.chan_id; - } else { - desc->req.rqtype = MEMTOMEM; - desc->req.peri = 0; - } + desc->req.peri = peri_id ? pch->chan.chan_id : 0; dma_async_tx_descriptor_init(&desc->txd, &pch->chan); @@ -630,12 +624,14 @@ static struct dma_async_tx_descriptor *pl330_prep_dma_cyclic( case DMA_TO_DEVICE: desc->rqcfg.src_inc = 1; desc->rqcfg.dst_inc = 0; + desc->req.rqtype = MEMTODEV; src = dma_addr; dst = pch->fifo_addr; break; case DMA_FROM_DEVICE: desc->rqcfg.src_inc = 0; desc->rqcfg.dst_inc = 1; + desc->req.rqtype = DEVTOMEM; src = pch->fifo_addr; dst = dma_addr; break; @@ -661,16 +657,12 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst, { struct dma_pl330_desc *desc; struct dma_pl330_chan *pch = to_pchan(chan); - struct dma_pl330_peri *peri = chan->private; struct pl330_info *pi; int burst; if (unlikely(!pch || !len)) return NULL; - if (peri && peri->rqtype != MEMTOMEM) - return NULL; - pi = &pch->dmac->pif; desc = __pl330_prep_dma_memcpy(pch, dst, src, len); @@ -679,6 +671,7 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst, desc->rqcfg.src_inc = 1; desc->rqcfg.dst_inc = 1; + desc->req.rqtype = MEMTOMEM; /* Select max possible burst size */ burst = pi->pcfg.data_bus_width / 8; @@ -707,24 +700,13 @@ pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, { struct dma_pl330_desc *first, *desc = NULL; struct dma_pl330_chan *pch = to_pchan(chan); - struct dma_pl330_peri *peri = chan->private; struct scatterlist *sg; unsigned long flags; int i; dma_addr_t addr; - if (unlikely(!pch || !sgl || !sg_len || !peri)) - return NULL; - - /* Make sure the direction is consistent */ - if ((direction == DMA_TO_DEVICE && - peri->rqtype != MEMTODEV) || - (direction == DMA_FROM_DEVICE && - peri->rqtype != DEVTOMEM)) { - dev_err(pch->dmac->pif.dev, "%s:%d Invalid Direction\n", - __func__, __LINE__); + if (unlikely(!pch || !sgl || !sg_len)) return NULL; - } addr = pch->fifo_addr; @@ -765,11 +747,13 @@ pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, if (direction == DMA_TO_DEVICE) { desc->rqcfg.src_inc = 1; desc->rqcfg.dst_inc = 0; + desc->req.rqtype = MEMTODEV; fill_px(&desc->px, addr, sg_dma_address(sg), sg_dma_len(sg)); } else { desc->rqcfg.src_inc = 0; desc->rqcfg.dst_inc = 1; + desc->req.rqtype = DEVTOMEM; fill_px(&desc->px, sg_dma_address(sg), addr, sg_dma_len(sg)); } @@ -876,28 +860,7 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) for (i = 0; i < num_chan; i++) { pch = &pdmac->peripherals[i]; - if (pdat) { - struct dma_pl330_peri *peri = &pdat->peri[i]; - - switch (peri->rqtype) { - case MEMTOMEM: - dma_cap_set(DMA_MEMCPY, pd->cap_mask); - break; - case MEMTODEV: - case DEVTOMEM: - dma_cap_set(DMA_SLAVE, pd->cap_mask); - dma_cap_set(DMA_CYCLIC, pd->cap_mask); - break; - default: - dev_err(&adev->dev, "DEVTODEV Not Supported\n"); - continue; - } - pch->chan.private = peri; - } else { - dma_cap_set(DMA_MEMCPY, pd->cap_mask); - pch->chan.private = NULL; - } - + pch->chan.private = pdat ? &pdat->peri_id[i] : NULL; INIT_LIST_HEAD(&pch->work_list); spin_lock_init(&pch->lock); pch->pl330_chid = NULL; @@ -911,6 +874,10 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) } pd->dev = &adev->dev; + if (pdat) + pd->cap_mask = pdat->cap_mask; + else + dma_cap_set(DMA_MEMCPY, pd->cap_mask); pd->device_alloc_chan_resources = pl330_alloc_chan_resources; pd->device_free_chan_resources = pl330_free_chan_resources; diff --git a/include/linux/amba/pl330.h b/include/linux/amba/pl330.h index 6db72da..12e023c 100644 --- a/include/linux/amba/pl330.h +++ b/include/linux/amba/pl330.h @@ -15,15 +15,6 @@ #include #include -struct dma_pl330_peri { - /* - * Peri_Req i/f of the DMAC that is - * peripheral could be reached from. - */ - u8 peri_id; /* specific dma id */ - enum pl330_reqtype rqtype; -}; - struct dma_pl330_platdata { /* * Number of valid peripherals connected to DMAC. @@ -34,7 +25,9 @@ struct dma_pl330_platdata { */ u8 nr_valid_peri; /* Array of valid peripherals */ - struct dma_pl330_peri *peri; + u8 *peri_id; + /* Operational capabilities */ + dma_cap_mask_t cap_mask; /* Bytes to allocate for MC buffer */ unsigned mcbuf_sz; };