From patchwork Fri Jan 29 22:35:11 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sinan Kaya X-Patchwork-Id: 8168141 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 [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id CFCA3BEEE5 for ; Fri, 29 Jan 2016 22:39:28 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id EE1A320390 for ; Fri, 29 Jan 2016 22:39:27 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 021F02038E for ; Fri, 29 Jan 2016 22:39:27 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1aPHfn-0002N7-Ln; Fri, 29 Jan 2016 22:37:47 +0000 Received: from smtp.codeaurora.org ([198.145.29.96]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aPHe9-00016l-4T for linux-arm-kernel@lists.infradead.org; Fri, 29 Jan 2016 22:36:09 +0000 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 3ACF260223; Fri, 29 Jan 2016 22:35:48 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 2A05760492; Fri, 29 Jan 2016 22:35:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: 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 Received: from drakthul.qualcomm.com (global_nat1_iad_fw.qualcomm.com [129.46.232.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: okaya@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 338AC60498; Fri, 29 Jan 2016 22:35:46 +0000 (UTC) From: Sinan Kaya To: dmaengine@vger.kernel.org, marc.zyngier@arm.com, mark.rutland@arm.com, timur@codeaurora.org, devicetree@vger.kernel.org, cov@codeaurora.org, vinod.koul@intel.com, jcm@redhat.com Subject: [PATCH V13 08/10] dma: qcom_hidma: read the channel id from HW Date: Fri, 29 Jan 2016 17:35:11 -0500 Message-Id: <1454106914-15857-9-git-send-email-okaya@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1454106914-15857-1-git-send-email-okaya@codeaurora.org> References: <1454106914-15857-1-git-send-email-okaya@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160129_143605_593813_0D345099 X-CRM114-Status: GOOD ( 16.44 ) X-Spam-Score: -1.9 (-) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: vikrams@codeaurora.org, arnd@arndb.de, eric.auger@linaro.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Sinan Kaya , linux-arm-kernel@lists.infradead.org, agross@codeaurora.org, shankerd@codeaurora.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Removing the flexibility to choose the event channel as there is no real use case right now. We have been using the values in ACPI that match the HW defaults. OS is reading the event-channel from the HW register now. Signed-off-by: Sinan Kaya Acked-by: Rob Herring --- .../devicetree/bindings/dma/qcom_hidma_mgmt.txt | 3 -- drivers/dma/qcom/hidma.c | 39 +--------------------- 2 files changed, 1 insertion(+), 41 deletions(-) diff --git a/Documentation/devicetree/bindings/dma/qcom_hidma_mgmt.txt b/Documentation/devicetree/bindings/dma/qcom_hidma_mgmt.txt index e3677a5..fd5618b 100644 --- a/Documentation/devicetree/bindings/dma/qcom_hidma_mgmt.txt +++ b/Documentation/devicetree/bindings/dma/qcom_hidma_mgmt.txt @@ -51,7 +51,6 @@ Required properties: - reg: Addresses for the transfer and event channel - interrupts: Should contain the event interrupt - desc-count: Number of asynchronous requests this channel can handle -- channel-index: The HW event channel completions will be delivered. - iommus: required a iommu node Example: @@ -75,7 +74,6 @@ Hypervisor OS configuration: interrupts = <0 389 0>; desc-count = <10>; iommus = <&system_mmu>; - channel-index = <4>; }; }; @@ -87,6 +85,5 @@ Guest OS configuration: <0 0x5c0b0000 0x0 0x1000>; interrupts = <0 389 0>; desc-count = <10>; - channel-index = <4>; iommus = <&system_mmu>; }; diff --git a/drivers/dma/qcom/hidma.c b/drivers/dma/qcom/hidma.c index ac20bdb..7180367 100644 --- a/drivers/dma/qcom/hidma.c +++ b/drivers/dma/qcom/hidma.c @@ -101,26 +101,6 @@ static unsigned int nr_desc_prm; module_param(nr_desc_prm, uint, 0644); MODULE_PARM_DESC(nr_desc_prm, "number of descriptors (default: 0)"); -#define HIDMA_MAX_CHANNELS 64 -static int channel_idx[HIDMA_MAX_CHANNELS] = { - [0 ... (HIDMA_MAX_CHANNELS - 1)] = -1 -}; - -/* - * Each DMA channel is associated with an event channel for interrupt - * delivery. The event channel index usually comes from the firmware through - * ACPI/DT. When a HIDMA channel is executed in the guest machine context (QEMU) - * the device tree gets auto-generated based on the memory and IRQ resources - * this driver uses on the host machine. Any device specific paraemeter such as - * channel-index gets ignored by the QEMU. - * We are using this command line parameter to pass the event channel index to - * the guest machine. - */ -static unsigned int num_channel_idx; -module_param_array_named(channel_idx, channel_idx, int, &num_channel_idx, - 0644); -MODULE_PARM_DESC(channel_idx, "channel index array for the notifications"); -static atomic_t channel_ref_count; /* process completed descriptors */ static void hidma_process_completed(struct hidma_chan *mchan) @@ -592,7 +572,6 @@ static int hidma_probe(struct platform_device *pdev) struct resource *trca_resource; struct resource *evca_resource; int chirq; - int current_channel_index = atomic_read(&channel_ref_count); void __iomem *evca; void __iomem *trca; int rc; @@ -668,22 +647,7 @@ static int hidma_probe(struct platform_device *pdev) goto dmafree; } - if (current_channel_index > HIDMA_MAX_CHANNELS) { - rc = -EINVAL; - goto dmafree; - } - - dmadev->chidx = -1; - device_property_read_u32(&pdev->dev, "channel-index", &dmadev->chidx); - - /* kernel command line override for the guest machine */ - if (channel_idx[current_channel_index] != -1) - dmadev->chidx = channel_idx[current_channel_index]; - - if (dmadev->chidx == -1) { - rc = -EINVAL; - goto dmafree; - } + dmadev->chidx = readl(dmadev->dev_trca + 0x28); /* Set DMA mask to 64 bits. */ rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64)); @@ -724,7 +688,6 @@ static int hidma_probe(struct platform_device *pdev) platform_set_drvdata(pdev, dmadev); pm_runtime_mark_last_busy(dmadev->ddev.dev); pm_runtime_put_autosuspend(dmadev->ddev.dev); - atomic_inc(&channel_ref_count); return 0; uninit: