From patchwork Fri Jun 7 14:46:30 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vidya Sagar X-Patchwork-Id: 10982167 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5225776 for ; Fri, 7 Jun 2019 14:50:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3F47C285D6 for ; Fri, 7 Jun 2019 14:50:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 335C5285C8; Fri, 7 Jun 2019 14:50:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id B2D6728564 for ; Fri, 7 Jun 2019 14:50:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=+OSSj2Ww7Q2iMzjoWwk8j3HnctAeE91kdOavKVrnGUc=; b=nQ4suBFS4hyl/Q Dtq4gBdxf2Ei5CIZU2OFMQSf7w6qNEnRwPi9XJMx4XvwNsUmFs1B/V3mh16dpOED27HlEzMFZVCeO 7lYWNuAMzN015U7k50h6w+odOTh6EXtl5D/ZJ24sUbmcItPzxqDAH2UDo0EJYPvTINA9sRlTuL14d KnCrKhY65ARTKZaId0JrVWo/MiV8sLlR2jdLaLdpZCepLw7KL4bftG1ZNs2LUbcmz3Uhyy3uvXdLG MgDOhHlMIngk2dDBozmPQKXTvAN0ozRay2BkZ/xzz9GaRuDQhIZqzFYxbzkZgKFCPqJJyMNE2dHRt HSjiwewJzgy3/b5bj8Ow==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hZGC3-00045b-PY; Fri, 07 Jun 2019 14:50:11 +0000 Received: from hqemgate16.nvidia.com ([216.228.121.65]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hZG9n-0001Ka-FQ for linux-arm-kernel@lists.infradead.org; Fri, 07 Jun 2019 14:47:53 +0000 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Fri, 07 Jun 2019 07:47:50 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Fri, 07 Jun 2019 07:47:50 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Fri, 07 Jun 2019 07:47:50 -0700 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL108.nvidia.com (172.18.146.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 7 Jun 2019 14:47:49 +0000 Received: from HQMAIL103.nvidia.com (172.20.187.11) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 7 Jun 2019 14:47:49 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL103.nvidia.com (172.20.187.11) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Fri, 7 Jun 2019 14:47:49 +0000 Received: from vidyas-desktop.nvidia.com (Not Verified[10.24.37.38]) by hqnvemgw01.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Fri, 07 Jun 2019 07:47:48 -0700 From: Vidya Sagar To: , , , , , , , , , , Subject: [PATCH V9 05/15] PCI: dwc: Add ext config space capability search API Date: Fri, 7 Jun 2019 20:16:30 +0530 Message-ID: <20190607144640.13427-6-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190607144640.13427-1-vidyas@nvidia.com> References: <20190607144640.13427-1-vidyas@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1559918870; bh=uoLnskp1VmgeTyUZq1dZGUPTH1nazNa7S9AbBzN2eOo=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=lpa/gu5W7ljdiAmf7IyLT54NFa8x5maepNsPGZMHjZc9mzgm/P697CfJTTej+/a2L qQWtn9LmfgjhqBkX0HeIwz4uZQI/B5FUbkgYmyK2ZR9YR6ST8oleXTDFSKaEXZrIYj F37A4Q/i76mAjChbxoIk1YYcPv87mIq53HL+0kltPukgw+FxK3zYfkD8SzZTmJfWXI TsimnZxcP7YvmktvFiY46SH/ITwiz5kuoaSQkdqulx47cK/oO1Nok7MEag8jBUldo0 6mN1WP2G/W4rTowEd1fpHap/5U3me4ubJOuG+HGiLprR9nstBoqmrdoFusVWaMT320 heWlxHxOWl9+g== X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190607_074751_600236_7D370261 X-CRM114-Status: GOOD ( 10.17 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, mmaddireddy@nvidia.com, kthota@nvidia.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, mperttunen@nvidia.com, linux-tegra@vger.kernel.org, digetx@gmail.com, vidyas@nvidia.com, linux-arm-kernel@lists.infradead.org, sagar.tv@gmail.com 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 Add extended configuration space capability search API using struct dw_pcie * pointer Signed-off-by: Vidya Sagar Acked-by: Gustavo Pimentel Acked-by: Thierry Reding --- Changes since [v8]: * Added Acked-by from Thierry Changes since [v7]: * Changed data types of return and arguments to be inline with data being returned and passed. Changes since [v6]: * None Changes since [v5]: * None Changes since [v4]: * None Changes since [v3]: * None Changes since [v2]: * None Changes since [v1]: * This is a new patch in v2 series drivers/pci/controller/dwc/pcie-designware.c | 41 ++++++++++++++++++++ drivers/pci/controller/dwc/pcie-designware.h | 1 + 2 files changed, 42 insertions(+) diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 38d76bd63b8f..d8be6c3339fa 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -53,6 +53,47 @@ u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) } EXPORT_SYMBOL_GPL(dw_pcie_find_capability); +static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start, + u8 cap) +{ + u32 header; + int ttl; + int pos = PCI_CFG_SPACE_SIZE; + + /* minimum 8 bytes per capability */ + ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; + + if (start) + pos = start; + + header = dw_pcie_readl_dbi(pci, pos); + /* + * If we have no capabilities, this is indicated by cap ID, + * cap version and next pointer all being 0. + */ + if (header == 0) + return 0; + + while (ttl-- > 0) { + if (PCI_EXT_CAP_ID(header) == cap && pos != start) + return pos; + + pos = PCI_EXT_CAP_NEXT(header); + if (pos < PCI_CFG_SPACE_SIZE) + break; + + header = dw_pcie_readl_dbi(pci, pos); + } + + return 0; +} + +u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap) +{ + return dw_pcie_find_next_ext_capability(pci, 0, cap); +} +EXPORT_SYMBOL_GPL(dw_pcie_find_ext_capability); + int dw_pcie_read(void __iomem *addr, int size, u32 *val) { if (!IS_ALIGNED((uintptr_t)addr, size)) { diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 6cb978132469..45cd7c88d28a 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -252,6 +252,7 @@ struct dw_pcie { container_of((endpoint), struct dw_pcie, ep) u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); +u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap); int dw_pcie_read(void __iomem *addr, int size, u32 *val); int dw_pcie_write(void __iomem *addr, int size, u32 val);