From patchwork Wed Jan 7 18:49:53 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Murali Karicheri X-Patchwork-Id: 5587831 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 251FD9F357 for ; Wed, 7 Jan 2015 19:12:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 348FF20380 for ; Wed, 7 Jan 2015 19:12:37 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4EA1E2037F for ; Wed, 7 Jan 2015 19:12:36 +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 1Y8vyy-0006xA-9f; Wed, 07 Jan 2015 19:09:28 +0000 Received: from devils.ext.ti.com ([198.47.26.153]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1Y8vgo-0001z4-BK for linux-arm-kernel@lists.infradead.org; Wed, 07 Jan 2015 18:50:46 +0000 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by devils.ext.ti.com (8.13.7/8.13.7) with ESMTP id t07Inq48004829; Wed, 7 Jan 2015 12:49:52 -0600 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id t07InqLF032388; Wed, 7 Jan 2015 12:49:52 -0600 Received: from dlep32.itg.ti.com (157.170.170.100) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.3.174.1; Wed, 7 Jan 2015 12:49:51 -0600 Received: from localhost.localdomain (ileax41-snat.itg.ti.com [10.172.224.153]) by dlep32.itg.ti.com (8.14.3/8.13.8) with ESMTP id t07InmZ9016988; Wed, 7 Jan 2015 12:49:51 -0600 From: Murali Karicheri To: , , , , , , , , , , , Subject: [PATCH v3 3/4] of/pci: add of_pci_dma_configure() update dma configuration Date: Wed, 7 Jan 2015 13:49:53 -0500 Message-ID: <1420656594-8908-4-git-send-email-m-karicheri2@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1420656594-8908-1-git-send-email-m-karicheri2@ti.com> References: <1420656594-8908-1-git-send-email-m-karicheri2@ti.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150107_105042_557080_52F47BDE X-CRM114-Status: UNSURE ( 9.00 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -5.0 (-----) Cc: Murali Karicheri X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, 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 Add of_pci_dma_configure() to allow updating the dma configuration of the pci device using the configuration from DT of the parent of the root bridge device. Signed-off-by: Murali Karicheri --- drivers/of/of_pci.c | 39 +++++++++++++++++++++++++++++++++++++++ include/linux/of_pci.h | 12 ++++++++++++ 2 files changed, 51 insertions(+) diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index 88471d3..34878c9 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -2,6 +2,7 @@ #include #include #include +#include #include #include @@ -229,6 +230,44 @@ parse_failed: return err; } EXPORT_SYMBOL_GPL(of_pci_get_host_bridge_resources); + +/** + * of_get_pci_root_bridge_parent - get the OF node of the root bridge's parent + * @dev: ptr to pci_dev struct of the pci device + * + * This function will traverse the bus up to the root bus starting with + * the child and return the OF node ptr to root bridge device's parent device. + */ +struct device_node *of_get_pci_root_bridge_parent(struct pci_dev *dev) +{ + struct pci_bus *bus = dev->bus; + struct device *bridge; + + while (!pci_is_root_bus(bus)) + bus = bus->parent; + bridge = bus->bridge; + + return bridge->parent->of_node; +} +EXPORT_SYMBOL_GPL(of_get_pci_root_bridge_parent); + +/** + * of_pci_dma_configure - Setup DMA configuration + * @dev: ptr to pci_dev struct of the pci device + * + * Function to update PCI devices's DMA configuration using the same + * info from the OF node of root host bridge's parent. + */ +void of_pci_dma_configure(struct pci_dev *pci_dev) +{ + struct device *dev = &pci_dev->dev; + struct device_node *parent_np; + + parent_np = of_get_pci_root_bridge_parent(pci_dev); + of_dma_configure(dev, parent_np); +} +EXPORT_SYMBOL_GPL(of_pci_dma_configure); + #endif /* CONFIG_OF_ADDRESS */ #ifdef CONFIG_PCI_MSI diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h index ce0e5ab..0465a2a 100644 --- a/include/linux/of_pci.h +++ b/include/linux/of_pci.h @@ -16,6 +16,8 @@ int of_pci_get_devfn(struct device_node *np); int of_irq_parse_and_map_pci(const struct pci_dev *dev, u8 slot, u8 pin); int of_pci_parse_bus_range(struct device_node *node, struct resource *res); int of_get_pci_domain_nr(struct device_node *node); +struct device_node *of_get_pci_root_bridge_parent(struct pci_dev *dev); +void of_pci_dma_configure(struct pci_dev *pci_dev); #else static inline int of_irq_parse_pci(const struct pci_dev *pdev, struct of_phandle_args *out_irq) { @@ -50,6 +52,16 @@ of_get_pci_domain_nr(struct device_node *node) { return -1; } + +static inline struct device_node +*of_get_pci_root_bridge_parent(struct pci_dev *dev) +{ + return NULL; +} + +static inline void of_pci_dma_configure(struct pci_dev *pci_dev) +{ +} #endif #if defined(CONFIG_OF_ADDRESS)