From patchwork Thu Aug 31 11:17:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 13371376 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BA11EC83F10 for ; Thu, 31 Aug 2023 11:18:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=qyMCdu1zxOYOKTqm7JuEQ3mTCgRg5oDE3oabaARJAf0=; b=ORuxUvRZ5pyFsL jXCDovA/UmqsN8fwl4YNqTrXhdm6J0XZHokYJUNKv+blIftCOkR4LVoVbjhuOk5XJ5Ws131uozjXw 6JnFtRfCNeWuiDkx9W4V1ao66UpgxvUq3E8k2PNvldfT0tCBh+ePWzN03FmOaaSeLA1K4KDXh/0pm 6YWYsMCLByz9AFJfL+89ZA8UUisH0BUI1dGo7h3OAtNKdshCCt6A/gL5xs0xq3fkQuKkLYM4jS3MU p7gFut18EGJhjYN/g1bNEkz7kdmdIwSHm93IKljGQuLM3fSEHcQ2a7akRkKNEDLyiRgYM5l2NW+/9 h1sNPZRJ9te5yPeYqtEA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qbfgg-00FBSR-3A; Thu, 31 Aug 2023 11:18:10 +0000 Received: from andre.telenet-ops.be ([2a02:1800:120:4::f00:15]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qbfgV-00FBLO-2K for linux-arm-kernel@lists.infradead.org; Thu, 31 Aug 2023 11:18:04 +0000 Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed40:6c13:6b1b:7366:87c0]) by andre.telenet-ops.be with bizsmtp id gBHs2A00d3874jb01BHsCq; Thu, 31 Aug 2023 13:17:53 +0200 Received: from rox.of.borg ([192.168.97.57]) by ramsan.of.borg with esmtp (Exim 4.95) (envelope-from ) id 1qbfgC-0026uz-7u; Thu, 31 Aug 2023 13:17:52 +0200 Received: from geert by rox.of.borg with local (Exim 4.95) (envelope-from ) id 1qbfgO-00CHY3-NZ; Thu, 31 Aug 2023 13:17:52 +0200 From: Geert Uytterhoeven To: Magnus Damm , Marek Vasut , Russell King , Arnd Bergmann , Ard Biesheuvel , Linus Walleij Cc: linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mtd@lists.infradead.org, Geert Uytterhoeven Subject: [PATCH/RFC 4/4] ARM: shmobile: sh73a0: Reserve boot area when SMP is enabled Date: Thu, 31 Aug 2023 13:17:47 +0200 Message-Id: <20eb4e7fca9c41a34500fc5984602b41006b4575.1693409184.git.geert+renesas@glider.be> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230831_041759_965527_B62F4248 X-CRM114-Status: GOOD ( 13.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org CPU core bringup on SH-Mobile AG5 uses the SYS Boot Address (SBAR) and Address Translation Area (APARMBAREA) registers to specify the base address and size of the boot area of the System CPU. With this enabled, when the System CPU accesses a physical address in the range from zero up to the configured size, the top address bits are replaced by those specified in the SBAR register. Hence any device residing in this low part of physical address space cannot be accessed. Prevent conflicts by reserving this memory region using request_mem_region(). Signed-off-by: Geert Uytterhoeven --- arch/arm/mach-shmobile/smp-sh73a0.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/arch/arm/mach-shmobile/smp-sh73a0.c b/arch/arm/mach-shmobile/smp-sh73a0.c index 453d488650295842..3757aed64c4241a5 100644 --- a/arch/arm/mach-shmobile/smp-sh73a0.c +++ b/arch/arm/mach-shmobile/smp-sh73a0.c @@ -44,10 +44,16 @@ static int sh73a0_boot_secondary(unsigned int cpu, struct task_struct *idle) static void __init sh73a0_smp_prepare_cpus(unsigned int max_cpus) { - void __iomem *ap = ioremap(AP_BASE, PAGE_SIZE); - void __iomem *sysc = ioremap(SYSC_BASE, PAGE_SIZE); + void __iomem *ap, *sysc; + + if (!request_mem_region(0, SZ_4K, "Boot Area")) { + pr_err("Failed to request boot area\n"); + return; + }; /* Map the reset vector (in headsmp.S) */ + ap = ioremap(AP_BASE, PAGE_SIZE); + sysc = ioremap(SYSC_BASE, PAGE_SIZE); writel(0, ap + APARMBAREA); /* 4k */ writel(__pa(shmobile_boot_vector), sysc + SBAR); iounmap(sysc);