From patchwork Fri Oct 23 20:01:50 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Boyd X-Patchwork-Id: 7478431 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 277289F36A for ; Fri, 23 Oct 2015 20:05:00 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4C0C720A1B for ; Fri, 23 Oct 2015 20:04:59 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7432C20A18 for ; Fri, 23 Oct 2015 20:04:58 +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 1ZpiYm-00070S-7H; Fri, 23 Oct 2015 20:03:32 +0000 Received: from smtp.codeaurora.org ([198.145.29.96]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZpiXY-00067B-E2 for linux-arm-kernel@lists.infradead.org; Fri, 23 Oct 2015 20:02:20 +0000 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id E088613EF07; Fri, 23 Oct 2015 20:01:55 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 486) id C6AC213EFBE; Fri, 23 Oct 2015 20:01:55 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from sboyd-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: sboyd@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id A202813EF07; Fri, 23 Oct 2015 20:01:54 +0000 (UTC) From: Stephen Boyd To: Andrew Morton Subject: [PATCH v3 2/4] lib: iomap_copy: Add __ioread32_copy() Date: Fri, 23 Oct 2015 13:01:50 -0700 Message-Id: <1445630512-10888-3-git-send-email-sboyd@codeaurora.org> X-Mailer: git-send-email 2.6.2.281.g6766aa3 In-Reply-To: <1445630512-10888-1-git-send-email-sboyd@codeaurora.org> References: <1445630512-10888-1-git-send-email-sboyd@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151023_130216_846110_28EF1673 X-CRM114-Status: GOOD ( 14.96 ) X-Spam-Score: -2.6 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-msm@vger.kernel.org, Bjorn Andersson , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Andy Gross MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Some drivers need to read data out of iomem areas 32-bits at a time. Add an API to do this. Cc: Bjorn Andersson Signed-off-by: Stephen Boyd --- include/linux/io.h | 1 + lib/iomap_copy.c | 21 +++++++++++++++++++++ 2 files changed, 22 insertions(+) diff --git a/include/linux/io.h b/include/linux/io.h index de64c1e53612..72c35e0a41d1 100644 --- a/include/linux/io.h +++ b/include/linux/io.h @@ -29,6 +29,7 @@ struct device; struct resource; __visible void __iowrite32_copy(void __iomem *to, const void *from, size_t count); +void __ioread32_copy(void *to, const void __iomem *from, size_t count); void __iowrite64_copy(void __iomem *to, const void *from, size_t count); #ifdef CONFIG_MMU diff --git a/lib/iomap_copy.c b/lib/iomap_copy.c index 4527e751b5e0..b8f1d6cbb200 100644 --- a/lib/iomap_copy.c +++ b/lib/iomap_copy.c @@ -42,6 +42,27 @@ void __attribute__((weak)) __iowrite32_copy(void __iomem *to, EXPORT_SYMBOL_GPL(__iowrite32_copy); /** + * __ioread32_copy - copy data from MMIO space, in 32-bit units + * @to: destination (must be 32-bit aligned) + * @from: source, in MMIO space (must be 32-bit aligned) + * @count: number of 32-bit quantities to copy + * + * Copy data from MMIO space to kernel space, in units of 32 bits at a + * time. Order of access is not guaranteed, nor is a memory barrier + * performed afterwards. + */ +void __ioread32_copy(void *to, const void __iomem *from, size_t count) +{ + u32 *dst = to; + const u32 __iomem *src = from; + const u32 __iomem *end = src + count; + + while (src < end) + *dst++ = __raw_readl(src++); +} +EXPORT_SYMBOL_GPL(__ioread32_copy); + +/** * __iowrite64_copy - copy data to MMIO space, in 64-bit or 32-bit units * @to: destination, in MMIO space (must be 64-bit aligned) * @from: source (must be 64-bit aligned)