From patchwork Thu Aug 31 11:17:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Geert Uytterhoeven X-Patchwork-Id: 13371375 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 214D1C83F10 for ; Thu, 31 Aug 2023 11:18:37 +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=xuSHxDPDfkvQ4dSj2tywyM6H4ZWBDQzBNM/Gge2smIU=; b=RpPA9D+Dfm7NM/ Dzbpo1HkP44YMGjVRljp9ZGcCBGnc32EYYEkQZihKOmj+rgDz/L/w6BINhbCVmfeMvy3o9OKYteAK bOfMfsJ5PlYWFEqi6B119IZGy+2gCAqpHWORs4ob7gRfdPGLVig0malhiTINRlWPidBm4h1d2p4/3 222olND7Rvgpd51nGJWa+zcM3qmRhnHPwIDw4pXnSBWks6G5AC+fomHgYPzthyhFKBwX0152HqW2y tHFePbd1w4LAFh0Gc1wPxoEZW+TOusDbfPSaQe0dZjQCaxbsmAlt1ZhBkeiBbDj1a+VZavHyaz3ql BOv7qcMUUOM0dxZBUcAg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qbfge-00FBQT-1o; Thu, 31 Aug 2023 11:18:08 +0000 Received: from albert.telenet-ops.be ([2a02:1800:110:4::f00:1a]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qbfgV-00FBLT-2I for linux-arm-kernel@lists.infradead.org; Thu, 31 Aug 2023 11:18:03 +0000 Received: from ramsan.of.borg ([IPv6:2a02:1810:ac12:ed40:6c13:6b1b:7366:87c0]) by albert.telenet-ops.be with bizsmtp id gBHs2A00c3874jb06BHs8g; 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-0026us-75; Thu, 31 Aug 2023 13:17:52 +0200 Received: from geert by rox.of.borg with local (Exim 4.95) (envelope-from ) id 1qbfgO-00CHXz-MS; 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 3/4] ARM: shmobile: r8a7779: Reserve boot area when SMP is enabled Date: Thu, 31 Aug 2023 13:17:46 +0200 Message-Id: <924961188abdf2adb52167edb7ed848a6efcca39.1693409184.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_909028_34DF11A6 X-CRM114-Status: GOOD ( 13.51 ) 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 R-Car H1 uses the ARM Reset Vector Address Register (AVECR) 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 AVECR 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-r8a7779.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/arm/mach-shmobile/smp-r8a7779.c b/arch/arm/mach-shmobile/smp-r8a7779.c index 1bc609986c160d2b..2b1b8248450c8dd2 100644 --- a/arch/arm/mach-shmobile/smp-r8a7779.c +++ b/arch/arm/mach-shmobile/smp-r8a7779.c @@ -38,7 +38,14 @@ static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle) static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus) { - void __iomem *base = ioremap(HPBREG_BASE, 0x1000); + void __iomem *base; + + if (!request_mem_region(0, SZ_4K, "Boot Area")) { + pr_err("Failed to request boot area\n"); + return; + }; + + base = ioremap(HPBREG_BASE, 0x1000); /* Map the reset vector (in headsmp-scu.S, headsmp.S) */ writel(__pa(shmobile_boot_vector), base + AVECR);