From patchwork Fri Aug 26 08:40:12 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: 3713 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 1811723FA5 for ; Fri, 26 Aug 2011 08:40:45 +0000 (UTC) Received: from mail-gx0-f180.google.com (mail-gx0-f180.google.com [209.85.161.180]) by fiordland.canonical.com (Postfix) with ESMTP id CAEAAA18740 for ; Fri, 26 Aug 2011 08:40:43 +0000 (UTC) Received: by mail-gx0-f180.google.com with SMTP id 10so3661138gxk.11 for ; Fri, 26 Aug 2011 01:40:43 -0700 (PDT) Received: by 10.150.236.12 with SMTP id j12mr1921512ybh.212.1314348043485; Fri, 26 Aug 2011 01:40:43 -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 10.151.27.20 with SMTP id e20cs274310ybj; Fri, 26 Aug 2011 01:40:43 -0700 (PDT) Received: by 10.90.187.2 with SMTP id k2mr763678agf.149.1314348043041; Fri, 26 Aug 2011 01:40:43 -0700 (PDT) Received: from mailout4.samsung.com (mailout4.samsung.com [203.254.224.34]) by mx.google.com with ESMTP id g8si2196603anp.172.2011.08.26.01.40.42; Fri, 26 Aug 2011 01:40:43 -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 epcpsbgm1.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 <0LQJ00I8I1F7RFL0@mailout4.samsung.com> for patches@linaro.org; Fri, 26 Aug 2011 17:40:41 +0900 (KST) X-AuditID: cbfee61a-b7cf1ae00000208e-c1-4e575c095ce3 Received: from epmmp1 ( [203.254.227.16]) by epcpsbgm1.samsung.com (MMPCPMTA) with SMTP id 7B.B6.08334.90C575E4; Fri, 26 Aug 2011 17:40:41 +0900 (KST) Received: from localhost.localdomain ([107.108.73.37]) by mmp1.samsung.com (iPlanet Messaging Server 5.2 Patch 2 (built Jul 14 2004)) with ESMTPA id <0LQJ005J71FB2H@mmp1.samsung.com> for patches@linaro.org; Fri, 26 Aug 2011 17:40:41 +0900 (KST) Date: Fri, 26 Aug 2011 14:10:12 +0530 From: Thomas Abraham Subject: [PATCH 4/6] DMA: PL330: Add device tree support In-reply-to: <1314348014-2481-4-git-send-email-thomas.abraham@linaro.org> 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, vinod.koul@intel.com, patches@linaro.org, jassisinghbrar@gmail.com, boojin.kim@samsung.com Message-id: <1314348014-2481-5-git-send-email-thomas.abraham@linaro.org> X-Mailer: git-send-email 1.6.6.rc2 Content-transfer-encoding: 7BIT References: <1314348014-2481-1-git-send-email-thomas.abraham@linaro.org> <1314348014-2481-2-git-send-email-thomas.abraham@linaro.org> <1314348014-2481-3-git-send-email-thomas.abraham@linaro.org> <1314348014-2481-4-git-send-email-thomas.abraham@linaro.org> X-Brightmail-Tracker: AAAAAA== For PL330 dma controllers instantiated from device tree, the channel lookup is based on phandle of the dma controller and dma request id specified by the client node. During probe, the private data of each channel of the controller is set to point to the device node of the dma controller. The 'chan_id' of the each channel is used as the dma request id. Client driver requesting dma channels specify the phandle of the dma controller and the request id. The pl330 filter function converts the phandle to the device node pointer and matches that with channel's private data. If a match is found, the request id from the client node and the 'chan_id' of the channel is matched. A channel is found if both the values match. Signed-off-by: Thomas Abraham --- .../devicetree/bindings/dma/arm-pl330.txt | 42 +++++++++++++ drivers/dma/pl330.c | 63 +++++++++++++++++++- 2 files changed, 103 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/dma/arm-pl330.txt diff --git a/Documentation/devicetree/bindings/dma/arm-pl330.txt b/Documentation/devicetree/bindings/dma/arm-pl330.txt new file mode 100644 index 0000000..46a8307 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/arm-pl330.txt @@ -0,0 +1,42 @@ +* ARM PrimeCell PL330 DMA Controller + +The ARM PrimeCell PL330 DMA controller can move blocks of memory contents +between memory and peripherals or memory to memory. + +Required properties: + - compatible: should one or more of the following + - arm,pl330-pdma - For controllers that support mem-to-dev and dev-to-mem + transfers. + - arm,pl330-mdma - For controllers that support mem-to-mem transfers only. + - arm,primecell - should be included for all pl330 dma controller nodes. + + - reg: physical base address of the controller and length of memory mapped + region. + + - interrupts: interrupt number to the cpu. + + - arm,primecell-periphid: should be 0x00041330. + + - arm,pl330-peri-reqs: number of actual peripheral requests connected to the + dma controller. Maximum value is 32. + +Example: (from Samsung's Exynos4 processor dtsi file) + + pdma0: pdma@12680000 { + compatible = "arm,pl330-pdma", "arm,primecell"; + reg = <0x12680000 0x1000>; + interrupts = <99>; + arm,primecell-periphid = <0x00041330>; + arm,pl330-peri-reqs = <30>; + }; + +Client drivers (device nodes requiring dma transfers from dev-to-mem or +mem-to-dev) should specify the DMA channel numbers using a two-value pair +as shown below. + + [property name] = <[phandle of the dma controller] [dma request id]>; + + where 'dma request id' is the dma request number which is connected + to the client controller. + + Example: tx-dma-channel = <&pdma0 12>; diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 9732995..984dc18 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -19,6 +19,7 @@ #include #include #include +#include #define NR_DEFAULT_DESC 16 @@ -277,6 +278,20 @@ bool pl330_filter(struct dma_chan *chan, void *param) if (chan->device->dev->driver != &pl330_driver.drv) return false; +#ifdef CONFIG_OF + if (chan->device->dev->of_node) { + const __be32 *prop_value; + phandle phandle; + struct device_node *node; + + prop_value = ((struct property *)param)->value; + phandle = be32_to_cpup(prop_value++); + node = of_find_node_by_phandle(phandle); + return ((chan->private == node) && + (chan->chan_id == be32_to_cpup(prop_value))); + } +#endif + peri_id = chan->private; return *peri_id == (unsigned)param; } @@ -777,6 +792,40 @@ static irqreturn_t pl330_irq_handler(int irq, void *data) return IRQ_NONE; } +#ifdef CONFIG_OF +static struct dma_pl330_platdata *pl330_parse_dt(struct device *dev) +{ + struct dma_pl330_platdata *pdat; + const void *value; + + pdat = devm_kzalloc(dev, sizeof(*pdat), GFP_KERNEL); + if (!pdat) + return NULL; + + value = of_get_property(dev->of_node, "arm,pl330-peri-reqs", NULL); + if (value) + pdat->nr_valid_peri = be32_to_cpup(value); + + if (of_device_is_compatible(dev->of_node, "arm,pl330-pdma")) { + dma_cap_set(DMA_SLAVE, pdat->cap_mask); + dma_cap_set(DMA_CYCLIC, pdat->cap_mask); + } else if (of_device_is_compatible(dev->of_node, "arm,pl330-mdma")) { + dma_cap_set(DMA_MEMCPY, pdat->cap_mask); + } else if (of_device_is_compatible(dev->of_node, "arm,primecell")) { + dma_cap_set(DMA_SLAVE, pdat->cap_mask); + dma_cap_set(DMA_CYCLIC, pdat->cap_mask); + dma_cap_set(DMA_MEMCPY, pdat->cap_mask); + } + + return pdat; +} +#else +static struct dma_pl330_platdata *pl330_parse_dt(struct device *dev) +{ + return NULL; +} +#endif + static int __devinit pl330_probe(struct amba_device *adev, const struct amba_id *id) { @@ -789,7 +838,13 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) int i, ret, irq; int num_chan; - pdat = adev->dev.platform_data; + if (adev->dev.of_node) { + pdat = pl330_parse_dt(&adev->dev); + if (!pdat) + return -ENOMEM; + } else { + pdat = adev->dev.platform_data; + } /* Allocate a new DMAC and its Channels */ pdmac = kzalloc(sizeof(*pdmac), GFP_KERNEL); @@ -862,7 +917,11 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) for (i = 0; i < num_chan; i++) { pch = &pdmac->peripherals[i]; - pch->chan.private = pdat ? &pdat->peri_id[i] : NULL; + if (!adev->dev.of_node) + pch->chan.private = pdat ? &pdat->peri_id[i] : NULL; + else + pch->chan.private = adev->dev.of_node; + INIT_LIST_HEAD(&pch->work_list); spin_lock_init(&pch->lock); pch->pl330_chid = NULL;