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Mon, 22 Feb 2021 00:47:36 -0800 Envelope-to: bharat.kumar.gogada@xilinx.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, bhelgaas@google.com Received: from [10.140.9.2] (port=33774 helo=xhdbharatku40.xilinx.com) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1lE6sR-0007zZ-S1; Mon, 22 Feb 2021 00:47:36 -0800 From: Bharat Kumar Gogada To: , CC: , Bharat Kumar Gogada Subject: [PATCH v3 1/2] PCI: xilinx-nwl: Enable coherent PCIe DMA traffic using CCI Date: Mon, 22 Feb 2021 14:17:31 +0530 Message-ID: <20210222084732.21521-1-bharat.kumar.gogada@xilinx.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: c96fbd61-02c4-497c-3f7e-08d8d70e8141 X-MS-TrafficTypeDiagnostic: DM6PR02MB6587: X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Oob-TLC-OOBClassifiers: OLM:6430; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Feb 2021 08:47:37.0076 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c96fbd61-02c4-497c-3f7e-08d8d70e8141 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: DM3NAM02FT010.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR02MB6587 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Add support for routing PCIe DMA traffic coherently when Cache Coherent Interconnect (CCI) is enabled in the system. The "dma-coherent" property is used to determine if CCI is enabled or not. Refer to https://developer.arm.com/documentation/ddi0470/k/preface for the CCI specification. Signed-off-by: Bharat Kumar Gogada --- drivers/pci/controller/pcie-xilinx-nwl.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/pci/controller/pcie-xilinx-nwl.c b/drivers/pci/controller/pcie-xilinx-nwl.c index 07e36661bbc2..8689311c5ef6 100644 --- a/drivers/pci/controller/pcie-xilinx-nwl.c +++ b/drivers/pci/controller/pcie-xilinx-nwl.c @@ -26,6 +26,7 @@ /* Bridge core config registers */ #define BRCFG_PCIE_RX0 0x00000000 +#define BRCFG_PCIE_RX1 0x00000004 #define BRCFG_INTERRUPT 0x00000010 #define BRCFG_PCIE_RX_MSG_FILTER 0x00000020 @@ -128,6 +129,7 @@ #define NWL_ECAM_VALUE_DEFAULT 12 #define CFG_DMA_REG_BAR GENMASK(2, 0) +#define CFG_PCIE_CACHE GENMASK(7, 0) #define INT_PCI_MSI_NR (2 * 32) @@ -675,6 +677,11 @@ static int nwl_pcie_bridge_init(struct nwl_pcie *pcie) nwl_bridge_writel(pcie, CFG_ENABLE_MSG_FILTER_MASK, BRCFG_PCIE_RX_MSG_FILTER); + /* This routes the PCIe DMA traffic to go through CCI path */ + if (of_dma_is_coherent(dev->of_node)) + nwl_bridge_writel(pcie, nwl_bridge_readl(pcie, BRCFG_PCIE_RX1) | + CFG_PCIE_CACHE, BRCFG_PCIE_RX1); + err = nwl_wait_for_link(pcie); if (err) return err; From patchwork Mon Feb 22 08:47:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bharat Kumar Gogada X-Patchwork-Id: 1442991 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-pci-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=xilinx.onmicrosoft.com header.i=@xilinx.onmicrosoft.com header.a=rsa-sha256 header.s=selector2-xilinx-onmicrosoft-com header.b=UDL3P98r; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4DkbSb6BVTz9sRf for ; Mon, 22 Feb 2021 19:48:47 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230110AbhBVIsf (ORCPT ); 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Mon, 22 Feb 2021 00:47:39 -0800 Envelope-to: bharat.kumar.gogada@xilinx.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, bhelgaas@google.com Received: from [10.140.9.2] (port=33774 helo=xhdbharatku40.xilinx.com) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1lE6sU-0007zZ-Na; Mon, 22 Feb 2021 00:47:39 -0800 From: Bharat Kumar Gogada To: , CC: , Bharat Kumar Gogada Subject: [PATCH v3 2/2] PCI: xilinx-nwl: Add optional "dma-coherent" property Date: Mon, 22 Feb 2021 14:17:32 +0530 Message-ID: <20210222084732.21521-2-bharat.kumar.gogada@xilinx.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20210222084732.21521-1-bharat.kumar.gogada@xilinx.com> References: <20210222084732.21521-1-bharat.kumar.gogada@xilinx.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: ad043258-54d4-4e0a-6b3b-08d8d70e8330 X-MS-TrafficTypeDiagnostic: BYAPR02MB5941: X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Oob-TLC-OOBClassifiers: OLM:1775; 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Signed-off-by: Bharat Kumar Gogada --- Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt b/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt index 01bf7fdf4c19..2d677e90a7e2 100644 --- a/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt +++ b/Documentation/devicetree/bindings/pci/xilinx-nwl-pcie.txt @@ -33,6 +33,8 @@ Required properties: - #address-cells: specifies the number of cells needed to encode an address. The value must be 0. +Optional properties: +- dma-coherent: present if DMA operations are coherent Example: ++++++++