From patchwork Wed Aug 7 09:32:33 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Petazzoni X-Patchwork-Id: 2840079 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 0989FBF535 for ; Wed, 7 Aug 2013 09:34:22 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id DD26720209 for ; Wed, 7 Aug 2013 09:34:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D6D53201FE for ; Wed, 7 Aug 2013 09:34:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932344Ab3HGJeT (ORCPT ); Wed, 7 Aug 2013 05:34:19 -0400 Received: from top.free-electrons.com ([176.31.233.9]:59111 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932340Ab3HGJeS (ORCPT ); Wed, 7 Aug 2013 05:34:18 -0400 Received: by mail.free-electrons.com (Postfix, from userid 106) id C58706E96; Wed, 7 Aug 2013 11:34:23 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=5.0 tests=BAYES_00,KHOP_BIG_TO_CC, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 Received: from localhost (unknown [37.160.138.38]) by mail.free-electrons.com (Postfix) with ESMTPSA id 403686E7E; Wed, 7 Aug 2013 11:33:16 +0200 (CEST) From: Thomas Petazzoni To: Bjorn Helgaas , linux-pci@vger.kernel.org, Russell King , Benjamin Herrenschmidt , Rob Herring , Thomas Gleixner , Jason Cooper , Andrew Lunn , Gregory Clement Cc: Ezequiel Garcia , linux-arm-kernel@lists.infradead.org, Maen Suleiman , Lior Amsalem , Thierry Reding Subject: [PATCHv7 12/13] PCI: mvebu: add support for MSI Date: Wed, 7 Aug 2013 11:32:33 +0200 Message-Id: <1375867954-2320-13-git-send-email-thomas.petazzoni@free-electrons.com> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1375867954-2320-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1375867954-2320-1-git-send-email-thomas.petazzoni@free-electrons.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This commit adds support for Message Signaled Interrupts in the Marvell PCIe host controller. The work is very simple: it simply gets a reference to the msi_chip associated to the PCIe controller thanks to the msi-parent DT property, and stores this reference in the pci_bus structure. This is enough to let the Linux PCI core use the functions of msi_chip to setup and teardown MSIs. Signed-off-by: Thomas Petazzoni Reviewed-by: Thierry Reding Acked-by: Bjorn Helgaas Tested-by: Daniel Price --- .../devicetree/bindings/pci/mvebu-pci.txt | 3 +++ drivers/pci/host/pci-mvebu.c | 31 ++++++++++++++++++++++ 2 files changed, 34 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/mvebu-pci.txt b/Documentation/devicetree/bindings/pci/mvebu-pci.txt index f8d4058..77e0ffe 100644 --- a/Documentation/devicetree/bindings/pci/mvebu-pci.txt +++ b/Documentation/devicetree/bindings/pci/mvebu-pci.txt @@ -12,6 +12,8 @@ Mandatory properties: - device_type, set to "pci" - ranges: ranges for the PCI memory and I/O regions, as well as the MMIO registers to control the PCIe interfaces. +- msi-parent: Link to the hardware entity that serves as the Message + Signaled Interrupt controller for this PCI controller. In addition, the Device Tree node must have sub-nodes describing each PCIe interface, having the following mandatory properties: @@ -46,6 +48,7 @@ pcie-controller { #size-cells = <2>; bus-range = <0x00 0xff>; + msi-parent = <&mpic>; ranges = <0x82000000 0 0xd0040000 0xd0040000 0 0x00002000 /* Port 0.0 registers */ 0x82000000 0 0xd0042000 0xd0042000 0 0x00002000 /* Port 2.0 registers */ diff --git a/drivers/pci/host/pci-mvebu.c b/drivers/pci/host/pci-mvebu.c index 13a633b..884cf82 100644 --- a/drivers/pci/host/pci-mvebu.c +++ b/drivers/pci/host/pci-mvebu.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include #include @@ -107,6 +108,7 @@ struct mvebu_pcie_port; struct mvebu_pcie { struct platform_device *pdev; struct mvebu_pcie_port *ports; + struct msi_chip *msi; struct resource io; struct resource realio; struct resource mem; @@ -695,6 +697,12 @@ static struct pci_bus *mvebu_pcie_scan_bus(int nr, struct pci_sys_data *sys) return bus; } +void mvebu_pcie_add_bus(struct pci_bus *bus) +{ + struct mvebu_pcie *pcie = sys_to_pcie(bus->sysdata); + bus->msi = pcie->msi; +} + resource_size_t mvebu_pcie_align_resource(struct pci_dev *dev, const struct resource *res, resource_size_t start, @@ -731,6 +739,7 @@ static void __init mvebu_pcie_enable(struct mvebu_pcie *pcie) hw.map_irq = mvebu_pcie_map_irq; hw.ops = &mvebu_pcie_ops; hw.align_resource = mvebu_pcie_align_resource; + hw.add_bus = mvebu_pcie_add_bus; pci_common_init(&hw); } @@ -755,6 +764,26 @@ mvebu_pcie_map_registers(struct platform_device *pdev, return devm_request_and_ioremap(&pdev->dev, ®s); } +static void __init mvebu_pcie_msi_enable(struct mvebu_pcie *pcie) +{ + struct device_node *msi_node; + struct irq_domain *msi_domain; + + msi_node = of_parse_phandle(pcie->pdev->dev.of_node, + "msi-parent", 0); + if (!msi_node) + return; + + msi_domain = irq_find_msi_host(msi_node); + if (!msi_domain) + return; + + pcie->msi = msi_domain->msi_chip; + + if (pcie->msi) + pcie->msi->dev = &pcie->pdev->dev; +} + static int __init mvebu_pcie_probe(struct platform_device *pdev) { struct mvebu_pcie *pcie; @@ -879,6 +908,8 @@ static int __init mvebu_pcie_probe(struct platform_device *pdev) i++; } + mvebu_pcie_msi_enable(pcie); + mvebu_pcie_enable(pcie); return 0;