From patchwork Fri Nov 11 16:18:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thierry Reding X-Patchwork-Id: 624014 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF14FC433FE for ; Fri, 11 Nov 2022 16:18:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233903AbiKKQSR (ORCPT ); Fri, 11 Nov 2022 11:18:17 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233887AbiKKQSR (ORCPT ); Fri, 11 Nov 2022 11:18:17 -0500 Received: from mail-wr1-x435.google.com (mail-wr1-x435.google.com [IPv6:2a00:1450:4864:20::435]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3BDCB66CBC; Fri, 11 Nov 2022 08:18:16 -0800 (PST) Received: by mail-wr1-x435.google.com with SMTP id bs21so7080886wrb.4; Fri, 11 Nov 2022 08:18:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=duNVBr4NS95zPWW8bT1x22oGyyVhM7a86TUcTxHp1y8=; b=IjVK3t9whScIPg9Wgf+fiup2cfWge0XRfQ6JysT8I2NheyXRpuxsur9CNWORmBHRHW EsfkaAf3f0c/oWHiy1rRDLMeYULqVnyWhVErSyktYz3+sFBVlRSnCa85CmGO0QPIIX/K UEBJqrgEdOFLfs0PuIAYa3lJLBqcYl8WFoqH8tcTH1XLvNyFa2pVrQ0xejkTAox0VV4S MsgLIgnCgGyukR3iqFsNTBMU7sNBRcFpEbGxK7W50Sf2yXZn6VzTZDM6UHbPAU+EQ/sV zAEHigkUVacz8yGeiHrxp2Sr0r3ci16B3hAGpab6XrUgNQ6bAlM1N6E1Sp6sfj6aounO YnoQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=duNVBr4NS95zPWW8bT1x22oGyyVhM7a86TUcTxHp1y8=; b=jDmswe5Li5+P7e6DODAiFuo5t65iyk7gWEFFrXEuBDsr5zX26xVnYxiKbiV9eE/WD7 /67xsW9qRbNUpu/mo2Gyg6IyP5iAliOMQh9F9495A3nSt8Cz0TzjxqMOqAus26NEHxfg 6ATJQS6HD+o1IzO9T1VzWmM4iwmhVbzstrqx5b9t21Tj++0zPyZ0eXEd58L+XFBusfHY l2Z8bJ9bQZ9H1ezCcy1P7TQri4VLxA4REccm84leiCCHm7pGHUZUOVMTnaucT9+QdbC6 VoHmhkBWfYk6AA1W8JiUXoY5yGtkwrmw0NREEm0rdJD6gGyQF1dtVkXa+pewWaoL7cgh U3mw== X-Gm-Message-State: ANoB5pmhuoKebha/pHLWPMEfvDAC6+6O1FaA2ScGpuG/0Nq86qs31wHy lX8qQv+7a05KYa4+hHPIMcc= X-Google-Smtp-Source: AA0mqf6R1nsyuduS+VIYfMfnl+022+/a6/3avlF870xD13VBBi+2XA4Y6EdCfqlEi1YIpt8t8p623g== X-Received: by 2002:adf:e78c:0:b0:236:704f:29f4 with SMTP id n12-20020adfe78c000000b00236704f29f4mr1754320wrm.11.1668183494645; Fri, 11 Nov 2022 08:18:14 -0800 (PST) Received: from localhost (p200300e41f201d00f22f74fffe1f3a53.dip0.t-ipconnect.de. [2003:e4:1f20:1d00:f22f:74ff:fe1f:3a53]) by smtp.gmail.com with ESMTPSA id m3-20020a5d6243000000b0023660f6cecfsm2269975wrv.80.2022.11.11.08.18.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 11 Nov 2022 08:18:13 -0800 (PST) From: Thierry Reding To: Rob Herring , Joerg Roedel Cc: Will Deacon , Robin Murphy , Nicolin Chen , Krishna Reddy , Ashish Mhetre , Dmitry Osipenko , Alyssa Rosenzweig , Janne Grunau , Sameer Pujar , Lucas Stach , devicetree@vger.kernel.org, iommu@lists.linux-foundation.org, linux-tegra@vger.kernel.org, asahi@lists.linux.dev Subject: [PATCH v11 2/5] of: Introduce of_translate_dma_region() Date: Fri, 11 Nov 2022 17:18:03 +0100 Message-Id: <20221111161806.630527-3-thierry.reding@gmail.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221111161806.630527-1-thierry.reding@gmail.com> References: <20221111161806.630527-1-thierry.reding@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Thierry Reding This function is similar to of_translate_dma_address() but also reads a length in addition to an address from a device tree property. Signed-off-by: Thierry Reding --- Changes in v11: - updated to use #dma-{address,size}-cells Changes in v10: - new patch drivers/of/address.c | 41 ++++++++++++++++++++++++++++++++++++++ include/linux/of_address.h | 2 ++ 2 files changed, 43 insertions(+) diff --git a/drivers/of/address.c b/drivers/of/address.c index db59bc60226c..89b9f4fbad8f 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -627,6 +627,47 @@ u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr) } EXPORT_SYMBOL(of_translate_dma_address); +/** + * of_translate_dma_region - Translate device tree address and size tuple + * @dev: device tree node for which to translate + * @prop: pointer into array of cells + * @start: return value for the start of the DMA range + * @length: return value for the length of the DMA range + * + * Returns a pointer to the cell immediately following the translated DMA region. + */ +const __be32 *of_translate_dma_region(struct device_node *dev, const __be32 *prop, + phys_addr_t *start, size_t *length) +{ + struct device_node *parent; + u64 address, size; + int na, ns; + + parent = __of_get_dma_parent(dev); + if (!parent) + return NULL; + + na = of_bus_addr_cells(parent, OF_CELLS_DMA); + ns = of_bus_size_cells(parent, OF_CELLS_DMA); + + of_node_put(parent); + + address = of_translate_dma_address(dev, prop); + if (address == OF_BAD_ADDR) + return NULL; + + size = of_read_number(prop + na, ns); + + if (start) + *start = address; + + if (length) + *length = size; + + return prop + na + ns; +} +EXPORT_SYMBOL(of_translate_dma_region); + const __be32 *__of_get_address(struct device_node *dev, int index, int bar_no, u64 *size, unsigned int *flags) { diff --git a/include/linux/of_address.h b/include/linux/of_address.h index 15354085ea35..a05c35b40295 100644 --- a/include/linux/of_address.h +++ b/include/linux/of_address.h @@ -38,6 +38,8 @@ struct of_pci_range { /* Translate a DMA address from device space to CPU space */ extern u64 of_translate_dma_address(struct device_node *dev, const __be32 *in_addr); +extern const __be32 *of_translate_dma_region(struct device_node *dev, const __be32 *addr, + phys_addr_t *start, size_t *length); #ifdef CONFIG_OF_ADDRESS extern u64 of_translate_address(struct device_node *np, const __be32 *addr);