From patchwork Wed Sep 23 00:16:55 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Daney X-Patchwork-Id: 7246731 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 34F10BEEC1 for ; Wed, 23 Sep 2015 00:20:32 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1AD14207CC for ; Wed, 23 Sep 2015 00:20:31 +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 29F1D207BF for ; Wed, 23 Sep 2015 00:20:30 +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 1ZeXkS-00056H-2x; Wed, 23 Sep 2015 00:17:24 +0000 Received: from mail-io0-x230.google.com ([2607:f8b0:4001:c06::230]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZeXkO-00052R-H0 for linux-arm-kernel@lists.infradead.org; Wed, 23 Sep 2015 00:17:21 +0000 Received: by iofb144 with SMTP id b144so30629736iof.1 for ; Tue, 22 Sep 2015 17:16:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id; bh=etomi1CHfb3pRTOMP9QJmfJb+sk7QqFH5f3CXEPeZ8Y=; b=laRzPUwqNmoLIF5TQPiZPAetOWBFgvfYku5fIMVRgftIN+Hcjj/7vdLh7MRKmGs+Ru alsWXMmanp6kqqqNgTGipbnnBSUb+dMDjj9MYxf4bIjtnzu+R0HFgBysAXx6/4Gh3sgV yXZQPQdHwcwYNDirOjvuwUdUSKyxVuGdxYXD9X5EVyrYDffpBgGZRS0y898K3+mzNsSt KE8Imp/v59qrCOQbMXpbLic1kP03JrLrxcLEaP/2DNVoPxG4oubMRNW/5MHVX8+TKq4Q ucirLLc2fYs/Dch7osSiBhq14RoX7dTP5QEL2Xh9v8qNo+foHjSbaikztOs9WTx1OBTZ 2YQw== X-Received: by 10.107.152.134 with SMTP id a128mr34810701ioe.164.1442967419799; Tue, 22 Sep 2015 17:16:59 -0700 (PDT) Received: from dl.caveonetworks.com (64.2.3.194.ptr.us.xo.net. [64.2.3.194]) by smtp.gmail.com with ESMTPSA id 68sm2387449ioz.5.2015.09.22.17.16.58 (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 22 Sep 2015 17:16:58 -0700 (PDT) Received: from dl.caveonetworks.com (localhost.localdomain [127.0.0.1]) by dl.caveonetworks.com (8.14.5/8.14.5) with ESMTP id t8N0GvkX013629; Tue, 22 Sep 2015 17:16:57 -0700 Received: (from ddaney@localhost) by dl.caveonetworks.com (8.14.5/8.14.5/Submit) id t8N0Gvbe013628; Tue, 22 Sep 2015 17:16:57 -0700 From: David Daney To: linux-kernel@vger.kernel.org, Bjorn Helgaas , linux-pci@vger.kernel.org, Will Deacon , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, Marc Zyngier Subject: [PATCH v2] PCI: generic: Add support for Cavium ThunderX PCIe root complexes. Date: Tue, 22 Sep 2015 17:16:55 -0700 Message-Id: <1442967415-13595-1-git-send-email-ddaney.cavm@gmail.com> X-Mailer: git-send-email 1.7.11.7 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150922_171720_624730_9394E176 X-CRM114-Status: GOOD ( 19.55 ) X-Spam-Score: -2.7 (--) 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: David Daney MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.1 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: David Daney The config space for external PCIe root complexes on some Cavium ThunderX SoCs is very similar to CAM and ECAM, but differs in the shift values that have to be applied to the bus and devfn numbers to compose that address window offset. These root complexes also have the interesting property that there is no root bridge, so the standard manner of limiting scanning to only the first device doesn't work. We can use the standard pci-host-generic driver if we make a minor addition to handle these differences, so we... Add a mapping function for ThunderX PCIe root complexes with a bus shift of 24 and devfn shift of 16. Ignore accesses for devices other than the first device on the primary bus. Document the whole thing in devicetree/bindings/pci/host-generic-pci.txt Signed-off-by: David Daney Acked-by: Will Deacon Acked-by: Arnd Bergmann --- This patch depends on: https://lkml.org/lkml/2015/9/22/1189 Changes from v1: - Added Acked-by: - Removed two patches from the set that were somewhat unrelated. .../devicetree/bindings/pci/host-generic-pci.txt | 8 +++--- drivers/pci/host/pci-host-generic.c | 29 ++++++++++++++++++++++ 2 files changed, 34 insertions(+), 3 deletions(-) diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.txt b/Documentation/devicetree/bindings/pci/host-generic-pci.txt index 105a968..a5aed0f 100644 --- a/Documentation/devicetree/bindings/pci/host-generic-pci.txt +++ b/Documentation/devicetree/bindings/pci/host-generic-pci.txt @@ -14,9 +14,11 @@ tree bindings communicated in pci.txt: Properties of the host controller node: -- compatible : Must be "pci-host-cam-generic" or "pci-host-ecam-generic" - depending on the layout of configuration space (CAM vs - ECAM respectively). +- compatible : One of the following with bus:devfn:reg mapped to the + PCI config space address window in the bit positions shown: + "pci-host-cam-generic" -- 'CAM' bits 16:8:0 + "pci-host-ecam-generic" -- 'ECAM' bits 20:12:0 + "cavium,pci-host-thunder-pem" -- bits 24:16:0 - device_type : Must be "pci". diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c index b163fdc..853f6f6 100644 --- a/drivers/pci/host/pci-host-generic.c +++ b/drivers/pci/host/pci-host-generic.c @@ -91,6 +91,32 @@ static struct gen_pci_cfg_bus_ops gen_pci_cfg_ecam_bus_ops = { } }; +static void __iomem *gen_pci_map_cfg_bus_thunder_pem(struct pci_bus *bus, + unsigned int devfn, + int where) +{ + struct gen_pci *pci = bus->sysdata; + resource_size_t idx = bus->number - pci->cfg.bus_range->start; + + /* + * Thunder PEM is a PCIe RC, but without a root bridge. On + * the primary bus, ignore accesses for devices other than + * the first device. + */ + if (idx == 0 && (devfn & ~7u)) + return NULL; + return pci->cfg.win[idx] + ((devfn << 16) | where); +} + +static struct gen_pci_cfg_bus_ops gen_pci_cfg_thunder_pem_bus_ops = { + .bus_shift = 24, + .ops = { + .map_bus = gen_pci_map_cfg_bus_thunder_pem, + .read = pci_generic_config_read, + .write = pci_generic_config_write, + } +}; + static const struct of_device_id gen_pci_of_match[] = { { .compatible = "pci-host-cam-generic", .data = &gen_pci_cfg_cam_bus_ops }, @@ -98,6 +124,9 @@ static const struct of_device_id gen_pci_of_match[] = { { .compatible = "pci-host-ecam-generic", .data = &gen_pci_cfg_ecam_bus_ops }, + { .compatible = "cavium,pci-host-thunder-pem", + .data = &gen_pci_cfg_thunder_pem_bus_ops }, + { }, }; MODULE_DEVICE_TABLE(of, gen_pci_of_match);