From patchwork Thu Mar 6 09:19:53 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Santosh Shilimkar X-Patchwork-Id: 25787 Return-Path: X-Original-To: linaro@patches.linaro.org Delivered-To: linaro@patches.linaro.org Received: from mail-pd0-f197.google.com (mail-pd0-f197.google.com [209.85.192.197]) by ip-10-151-82-157.ec2.internal (Postfix) with ESMTPS id EBD0D203C3 for ; Thu, 6 Mar 2014 09:21:24 +0000 (UTC) Received: by mail-pd0-f197.google.com with SMTP id fp1sf5357866pdb.8 for ; Thu, 06 Mar 2014 01:21:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:delivered-to:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:sender:precedence:list-id :x-original-sender:x-original-authentication-results:mailing-list :list-post:list-help:list-archive:list-unsubscribe:content-type; bh=FP3C1C3UQDhNaLbPfJr2X5fbaMul+28z7ciFBV4aQlY=; b=C6mawzcAtOYuYaRZKdraowAWH8qQl1vobDGoRy6TL2QHI38oJIPyG8xS8MwkL+DVt8 M9Bywxn89kvnRoj2CgsnhtyON7wQEBEKoMdZx7opXY48CzWhdU0T70FqpKN/I0TXEM9N uJ+Frue25KBsIvudXs6IlmeH9z0Xw8McGWf1AGuvgk2X65R1EDHcSwDFtJjl3v26VnVI 9uZ0FFbpEEfTYCEVDSPOwEmrE7ERi3TUqrNvI3LNBCsiMlUeAVKpciBYnIxiCbKql+OO XeX8vGPJPDYi33be3P+3SfPqvxi2Zrd0+vKNXxv4Oy6aCkLJJ7t404MqI1HtfaYYlNm7 vodA== X-Gm-Message-State: ALoCoQmWM0MYErl0lCTCVjgYXt51EG6wa/t+/nUgoSEtBqBIsWV2+W/HQ+yCIzNzXowrqMkNLxAR X-Received: by 10.67.4.202 with SMTP id cg10mr4829803pad.42.1394097684219; Thu, 06 Mar 2014 01:21:24 -0800 (PST) X-BeenThere: patchwork-forward@linaro.org Received: by 10.140.22.139 with SMTP id 11ls674084qgn.84.gmail; Thu, 06 Mar 2014 01:21:24 -0800 (PST) X-Received: by 10.58.132.203 with SMTP id ow11mr4378273veb.1.1394097684016; Thu, 06 Mar 2014 01:21:24 -0800 (PST) Received: from mail-vc0-f182.google.com (mail-vc0-f182.google.com [209.85.220.182]) by mx.google.com with ESMTPS id g4si932454vch.148.2014.03.06.01.21.23 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 06 Mar 2014 01:21:24 -0800 (PST) Received-SPF: neutral (google.com: 209.85.220.182 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) client-ip=209.85.220.182; Received: by mail-vc0-f182.google.com with SMTP id id10so2349321vcb.27 for ; Thu, 06 Mar 2014 01:21:23 -0800 (PST) X-Received: by 10.221.26.10 with SMTP id rk10mr4248115vcb.0.1394097683922; Thu, 06 Mar 2014 01:21:23 -0800 (PST) X-Forwarded-To: patchwork-forward@linaro.org X-Forwarded-For: patch@linaro.org patchwork-forward@linaro.org Delivered-To: patch@linaro.org Received: by 10.220.78.9 with SMTP id i9csp25099vck; Thu, 6 Mar 2014 01:21:23 -0800 (PST) X-Received: by 10.66.146.229 with SMTP id tf5mr13218572pab.50.1394097683354; Thu, 06 Mar 2014 01:21:23 -0800 (PST) Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id a3si4467809pay.339.2014.03.06.01.21.22; Thu, 06 Mar 2014 01:21:22 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752753AbaCFJVE (ORCPT + 26 others); Thu, 6 Mar 2014 04:21:04 -0500 Received: from bear.ext.ti.com ([192.94.94.41]:43591 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752734AbaCFJVA (ORCPT ); Thu, 6 Mar 2014 04:21:00 -0500 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id s269KNRS005454; Thu, 6 Mar 2014 03:20:23 -0600 Received: from DLEE71.ent.ti.com (dlee71.ent.ti.com [157.170.170.114]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id s269KNS3029235; Thu, 6 Mar 2014 03:20:23 -0600 Received: from dflp33.itg.ti.com (10.64.6.16) by DLEE71.ent.ti.com (157.170.170.114) with Microsoft SMTP Server id 14.3.174.1; Thu, 6 Mar 2014 03:20:22 -0600 Received: from ula0393909.itg.ti.com (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id s269K8N0031770; Thu, 6 Mar 2014 03:20:19 -0600 From: Santosh Shilimkar To: CC: , , Grygorii Strashko , Greg Kroah-Hartman , Russell King , Arnd Bergmann , Olof Johansson , Grant Likely , Rob Herring , Catalin Marinas , Linus Walleij , Santosh Shilimkar Subject: [PATCH 2/7] of: introduce of_dma_get_range() helper Date: Thu, 6 Mar 2014 17:19:53 +0800 Message-ID: <1394097598-17622-3-git-send-email-santosh.shilimkar@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1394097598-17622-1-git-send-email-santosh.shilimkar@ti.com> References: <1394097598-17622-1-git-send-email-santosh.shilimkar@ti.com> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: santosh.shilimkar@ti.com X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.220.182 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , From: Grygorii Strashko The of_dma_get_range() allows to find "dma-range" property for the specified device and parse it. dma-ranges format: DMA addr (dma_addr) : naddr cells CPU addr (phys_addr_t) : pna cells size : nsize cells Cc: Greg Kroah-Hartman Cc: Russell King Cc: Arnd Bergmann Cc: Olof Johansson Cc: Grant Likely Cc: Rob Herring Cc: Catalin Marinas Cc: Linus Walleij Signed-off-by: Grygorii Strashko Signed-off-by: Santosh Shilimkar --- drivers/of/platform.c | 85 +++++++++++++++++++++++++++++++++++++++++++ include/linux/of_platform.h | 8 ++++ 2 files changed, 93 insertions(+) diff --git a/drivers/of/platform.c b/drivers/of/platform.c index 404d1da..2265a55 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -485,4 +485,89 @@ int of_platform_populate(struct device_node *root, return rc; } EXPORT_SYMBOL_GPL(of_platform_populate); + +/** + * of_dma_get_range - Get DMA range info + * @np: device node to get DMA range info + * @dma_addr: pointer to store initial DMA address of DMA range + * @paddr: pointer to store initial CPU address of DMA range + * @size: pointer to store size of DMA range + * + * Look in bottom up direction for the first "dma-range" property + * and parse it. + * dma-ranges format: + * DMA addr (dma_addr) : naddr cells + * CPU addr (phys_addr_t) : pna cells + * size : nsize cells + * + * It returns -ENODEV if "dma-ranges" property was not found + * for this device in DT. + */ +extern int of_dma_get_range(struct device_node *np, dma_addr_t *dma_addr, + phys_addr_t *paddr, phys_addr_t *size) +{ + struct device_node *node = np; + const u32 *ranges = NULL; + int len, naddr, nsize, pna; + int ret = 0; + + if (!node) + return -EINVAL; + + while (1) { + naddr = of_n_addr_cells(node); + nsize = of_n_size_cells(node); + node = of_get_next_parent(node); + if (!node) + break; + + ranges = of_get_property(node, "dma-ranges", &len); + + /* Ignore empty ranges, they imply no translation required */ + if (ranges && len > 0) + break; + + /* + * At least empty ranges has to be defined for parent node if + * DMA is supported + */ + if (!ranges) + break; + } + + if (!ranges) { + pr_debug("%s: no dma-ranges found for node(%s)\n", + __func__, np->full_name); + ret = -ENODEV; + goto out; + } + + len /= sizeof(u32); + + pna = of_n_addr_cells(node); + + /* dma-ranges format: + * DMA addr : naddr cells + * CPU addr : pna cells + * size : nsize cells + */ + *dma_addr = of_read_number(ranges, naddr); + *paddr = of_translate_dma_address(np, ranges); + if (*paddr == OF_BAD_ADDR) { + pr_err("%s: translation of DMA address(%pad) to CPU address failed node(%s)\n", + __func__, dma_addr, np->full_name); + ret = -EINVAL; + } + + *size = of_read_number(ranges + naddr + pna, nsize); + + pr_debug("dma_addr(%pad) cpu_addr(%pa) size(%pa)\n", + dma_addr, paddr, size); + +out: + of_node_put(node); + + return ret; +} +EXPORT_SYMBOL_GPL(of_dma_get_range); #endif /* CONFIG_OF_ADDRESS */ diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h index 05cb4a9..ba7d3dc 100644 --- a/include/linux/of_platform.h +++ b/include/linux/of_platform.h @@ -72,6 +72,8 @@ extern int of_platform_populate(struct device_node *root, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent); +extern int of_dma_get_range(struct device_node *np, dma_addr_t *dma_addr, + phys_addr_t *paddr, phys_addr_t *size); #else static inline int of_platform_populate(struct device_node *root, const struct of_device_id *matches, @@ -80,6 +82,12 @@ static inline int of_platform_populate(struct device_node *root, { return -ENODEV; } + +static inline int of_dma_get_range(struct device_node *np, dma_addr_t *dma_addr, + phys_addr_t *paddr, phys_addr_t *size) +{ + return -ENODEV; +} #endif #endif /* _LINUX_OF_PLATFORM_H */