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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 F12EEC41517 for ; Wed, 24 Jul 2019 17:49:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CCA5A229F4 for ; Wed, 24 Jul 2019 17:49:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="kOBMwq31" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728866AbfGXRtK (ORCPT ); Wed, 24 Jul 2019 13:49:10 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:9269 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725851AbfGXRtJ (ORCPT ); Wed, 24 Jul 2019 13:49:09 -0400 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 24 Jul 2019 10:49:05 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Wed, 24 Jul 2019 10:49:08 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Wed, 24 Jul 2019 10:49:08 -0700 Received: from HQMAIL107.nvidia.com (172.20.187.13) by HQMAIL105.nvidia.com (172.20.187.12) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 24 Jul 2019 17:49:07 +0000 Received: from hqnvemgw01.nvidia.com (172.20.150.20) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Wed, 24 Jul 2019 17:49:08 +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 ; Wed, 24 Jul 2019 10:49:07 -0700 From: Vidya Sagar To: , , , , , , , , , , CC: , , , , , , , , , , Subject: [PATCH V14 05/13] PCI: dwc: Add ext config space capability search API Date: Wed, 24 Jul 2019 23:18:16 +0530 Message-ID: <20190724174824.20933-6-vidyas@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190724174824.20933-1-vidyas@nvidia.com> References: <20190724174824.20933-1-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=1563990546; bh=zfrhQUkxT9cLXGjzknRdGQ25/ub81Adr4/ls57Yv98U=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:X-NVConfidentiality:MIME-Version: Content-Type; b=kOBMwq31puPDbmfLoORsXMbcj76M/2IRejttUsrYIAV1Qx2iNCjefmkxcvzZVa9Qw vY6+IhVCTfwYHtwT2wHO4BuwYMvO0MQPoW8/+fKW99ABaUf+NWzIAW2CkNHc+bemvI NQedDF4gYIsieC42JyHlrKvXaEE8ha2LLivyhhd/uXIQjBom6cZMqYyW808tA788ou IS2QEnvjpMsMAVXd6v8jZRmvNZwDBv7IluUX0nVScROZiRYgv+oTRlqcj+pR2Nlt/V RmF36GaVU+lSwikIvTvT9pNVfIlySy02MwBASN43F1r50bns2/RoU1VfXClnFNJjiW CQL8d/gJBfNgQ== 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 --- V14: * Added a full stop(.) at the end of commit message. V13: * None V12: * None V11: * None V10: * None V9: * Added Acked-by from Thierry V8: * Changed data types of return and arguments to be inline with data being returned and passed. V7: * None V6: * None V5: * None V4: * None V3: * None V2: * 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 7818b4febb08..181449e342f1 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 d8c66a6827dc..11c223471416 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