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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1DA5DC4321E for ; Thu, 3 Nov 2022 13:39:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230389AbiKCNjK (ORCPT ); Thu, 3 Nov 2022 09:39:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231492AbiKCNjJ (ORCPT ); Thu, 3 Nov 2022 09:39:09 -0400 Received: from mail-ed1-x52d.google.com (mail-ed1-x52d.google.com [IPv6:2a00:1450:4864:20::52d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EFE25E5D; Thu, 3 Nov 2022 06:39:07 -0700 (PDT) Received: by mail-ed1-x52d.google.com with SMTP id v17so3032726edc.8; Thu, 03 Nov 2022 06:39:07 -0700 (PDT) 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=uX22cDpWGlUuPxGTLIoQK3Y1p1D3Uxlzij7fXDiiEFw=; b=gCwldoBtj07aHAVjZpRaiNAtJQ1xpBdafZG15M/Q3V1MC8wcFh7zyLLFtYXqzeS3QM b/+iffDp+4mGfJqqkBCJfApgA4mpiJAmBw5xFhKWkaSkHoqVrPsi1oX3TDAYIDpiQ8MV q6hHuEoEEwwW762kdwY9ho8sHTjYuRn97iw441xMfVY8KB0p03uJExrFwLCp0dVnwGgX Cj6B5qUSYZQQEWlHRlKdFxRF4wdD1svlRdDwUoGhqme4XJS6/8Ti73PRKQ+YPQVjsf8y fb4kyUeL0ZbelUPBatu/Ah0ksNFlMOgJxpJaIbIP5Gd3KokT+hTGfFQ4tYRiTJPTVonI bCuw== 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=uX22cDpWGlUuPxGTLIoQK3Y1p1D3Uxlzij7fXDiiEFw=; b=cidKcyyGTwrnCcVgGz3QXP68nZRra7R48ik9416kdBSog2Ai7THrpqSdJYT4bPMwt2 k3AQpt1yAi6ojiAiEbB/rMThmU7YcbeOsjTzTKa+tUtZ8oIbgpWCayQkYe01Rdk4dyvw Q3zz2Wi5XpiOsBrXAmfT3zupAA/no67FwyzhxqbugS56I/xlGs9txcHBzadbOltDEkVa ppzp+2yN3EiMovTJF+gPR24dsytkQJvZnZYxnyCyEDJR3qjcwVwcyQJzG/UMaDgN6nM4 yYyp3dg7kDnkrV+FkrD6vyLUL5VWExHXsqBKA/sYjLN3MYRYMZz9p7gZqRlL8fAKrfMN tcoA== X-Gm-Message-State: ACrzQf200WHn7ihJ2ffjUXq1x58DpJl9dbMmthDCT8NiNGjWPOw28C5S gt5udBB7VRUAVgeRdUhKCuM= X-Google-Smtp-Source: AMsMyM6jDCSoXipugN3unbx1tOvfIW9T5HX7oiqQN2D4iLqyGC7syC2gfpyaEgdiggi/2ppymGLyGQ== X-Received: by 2002:a05:6402:42c7:b0:461:bea2:8a70 with SMTP id i7-20020a05640242c700b00461bea28a70mr31280033edc.261.1667482746439; Thu, 03 Nov 2022 06:39:06 -0700 (PDT) Received: from localhost (p200300e41f201d00f22f74fffe1f3a53.dip0.t-ipconnect.de. [2003:e4:1f20:1d00:f22f:74ff:fe1f:3a53]) by smtp.gmail.com with ESMTPSA id m20-20020a170906259400b0077d6f628e14sm516444ejb.83.2022.11.03.06.39.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Nov 2022 06:39:05 -0700 (PDT) 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 , devicetree@vger.kernel.org, iommu@lists.linux-foundation.org, linux-tegra@vger.kernel.org, asahi@lists.linux.dev Subject: [PATCH v10 1/5] of: Introduce of_translate_dma_region() Date: Thu, 3 Nov 2022 14:38:56 +0100 Message-Id: <20221103133900.1473855-2-thierry.reding@gmail.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221103133900.1473855-1-thierry.reding@gmail.com> References: <20221103133900.1473855-1-thierry.reding@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 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 c34ac33b7338..14f137a21b0c 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -626,6 +626,47 @@ 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_n_addr_cells(parent); + ns = of_bus_n_size_cells(parent); + + 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 265f26eeaf6b..376671594746 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); -- 2.38.1