From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B71DBC2BCA1 for ; Fri, 7 Jun 2019 14:48:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8D05A212F5 for ; Fri, 7 Jun 2019 14:48:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="lpa/gu5W" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729613AbfFGOsA (ORCPT ); Fri, 7 Jun 2019 10:48:00 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:5179 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729516AbfFGOrx (ORCPT ); Fri, 7 Jun 2019 10:47:53 -0400 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: , , , , , , , , , , CC: , , , , , , , , , , 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 Content-Type: text/plain 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== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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); -- 2.17.1