From patchwork Tue Jan 30 20:22:34 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabrizio Castro X-Patchwork-Id: 10192429 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 72847601A0 for ; Tue, 30 Jan 2018 20:24:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 623D826AE3 for ; Tue, 30 Jan 2018 20:24:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 56CAE27BA5; Tue, 30 Jan 2018 20:24:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [65.50.211.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id D1B0826AE3 for ; Tue, 30 Jan 2018 20:24:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:References: In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=dPqLcxIJmHtS6HTd2Ha3rRmISHupLPkzS4qTaXij5rU=; b=kl7Ubq+upHXGAhZMTYL0Mxe7N0 f1GUXVcdrQHpnDr2RXqyN1mx7FP3n3uA1fh+wD9fQ8jXyOmoPv0dGt09VpTmXeCPHwPNnKGp2arQT WJv3ODk6KgCNbMUbBFZXr2QNUkgZwzmYkJcI4UUbp6GsU5ViR+aUfkXMy07o9nVBtwLCcxQUqwh66 0Vl3YBruTVzZVlFCjUg1oMEqAkhRxMzVJZQRiH35WzBZX9We9wgSZjlbxrO6/aMA46aL6yngpassD DHGawJmGQEEdO/WkEQWb4DswwpeQ4vxDi/XFrkeG7ObJZiFlNyhOAIercek8qd4dSckbLaHGavsFX ffviVLsg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1egcRi-0006FH-Hs; Tue, 30 Jan 2018 20:23:58 +0000 Received: from relmlor3.renesas.com ([210.160.252.173] helo=relmlie2.idc.renesas.com) by bombadil.infradead.org with esmtp (Exim 4.89 #1 (Red Hat Linux)) id 1egcRA-0005jU-3J for linux-arm-kernel@lists.infradead.org; Tue, 30 Jan 2018 20:23:25 +0000 Received: from unknown (HELO relmlir1.idc.renesas.com) ([10.200.68.151]) by relmlie2.idc.renesas.com with ESMTP; 31 Jan 2018 05:23:12 +0900 Received: from relmlii1.idc.renesas.com (relmlii1.idc.renesas.com [10.200.68.65]) by relmlir1.idc.renesas.com (Postfix) with ESMTP id 72B2A48842; Wed, 31 Jan 2018 05:23:12 +0900 (JST) X-IronPort-AV: E=Sophos;i="5.46,436,1511794800"; d="scan'208";a="269795794" Received: from unknown (HELO fabrizio-dev.ree.adwin.renesas.com) ([10.226.37.88]) by relmlii1.idc.renesas.com with ESMTP; 31 Jan 2018 05:23:07 +0900 From: Fabrizio Castro To: Philipp Zabel , Rob Herring , Mark Rutland , Wim Van Sebroeck , Russell King , Catalin Marinas , Will Deacon , Michael Turquette , Stephen Boyd , Simon Horman , Magnus Damm , Geert Uytterhoeven , Wolfram Sang Subject: [RFC v3 01/25] ARM: shmobile: Add watchdog support Date: Tue, 30 Jan 2018 20:22:34 +0000 Message-Id: <1517343778-27902-2-git-send-email-fabrizio.castro@bp.renesas.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1517343778-27902-1-git-send-email-fabrizio.castro@bp.renesas.com> References: <1517343778-27902-1-git-send-email-fabrizio.castro@bp.renesas.com> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fabrizio Castro , devicetree@vger.kernel.org, Chris Paterson , linux-watchdog@vger.kernel.org, Biju Das , linux-renesas-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Ramesh Shanmugasundaram , linux-clk@vger.kernel.org, Guenter Roeck 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 On R-Car Gen2 and RZ/G1 platforms, we use the SBAR registers to make non boot CPUs run a routine designed to bring up SMP and deal with hot plug. The value contained in the SBAR registers is not initialized by a WDT triggered reset, which means that after a WDT triggered reset we jump to the SMP bring up routine, preventing the system from executing the bootrom code. The purpose of this patch is to jump to the bootrom code in case of a WDT triggered reset, and keep the SMP functionality untouched. In order to tell if the code had been called due to the WDT overflowing we are testing WOVF from register RWTCSRA. The new function shmobile_boot_vector_gen2 isn't replacing shmobile_boot_vector for backward compatibility reasons. The kernel will install the best option (either shmobile_boot_vector or shmobile_boot_vector_gen2) to ICRAM1 after parsing the device tree, according to the amount of memory available. Since shmobile_boot_vector has become bigger, "reg" property of nodes compatible with "renesas,smp-sram" now need to be set to a value greater or equal to "<0 0x60>". Signed-off-by: Fabrizio Castro Signed-off-by: Ramesh Shanmugasundaram --- v2->v3: * purge shmobile_wdt_clock_status variable, and add shmobile_boot_cpu_gen2 v1->v2: * reinstated shmobile_boot_vector and added shmobile_boot_vector_gen2 arch/arm/mach-shmobile/common.h | 6 +++++ arch/arm/mach-shmobile/headsmp.S | 55 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 61 insertions(+) diff --git a/arch/arm/mach-shmobile/common.h b/arch/arm/mach-shmobile/common.h index a8fa4f7..d8c11f5 100644 --- a/arch/arm/mach-shmobile/common.h +++ b/arch/arm/mach-shmobile/common.h @@ -7,6 +7,12 @@ extern void shmobile_init_delay(void); extern void shmobile_boot_vector(void); extern unsigned long shmobile_boot_fn; extern unsigned long shmobile_boot_size; +#ifdef CONFIG_ARCH_RCAR_GEN2 +extern void shmobile_boot_vector_gen2(void); +extern unsigned long shmobile_boot_fn_gen2; +extern unsigned long shmobile_boot_cpu_gen2; +extern unsigned long shmobile_boot_size_gen2; +#endif /* CONFIG_ARCH_RCAR_GEN2 */ extern void shmobile_smp_boot(void); extern void shmobile_smp_sleep(void); extern void shmobile_smp_hook(unsigned int cpu, unsigned long fn, diff --git a/arch/arm/mach-shmobile/headsmp.S b/arch/arm/mach-shmobile/headsmp.S index 32e0bf6..cef8e8c 100644 --- a/arch/arm/mach-shmobile/headsmp.S +++ b/arch/arm/mach-shmobile/headsmp.S @@ -16,6 +16,11 @@ #include #include +#define SCTLR_MMU 0x01 +#define BOOTROM_ADDRESS 0xE6340000 +#define RWTCSRA_ADDRESS 0xE6020004 +#define RWTCSRA_WOVF 0x10 + /* * Reset vector for secondary CPUs. * This will be mapped at address 0 by SBAR register. @@ -37,6 +42,56 @@ shmobile_boot_fn: shmobile_boot_size: .long . - shmobile_boot_vector +#ifdef CONFIG_ARCH_RCAR_GEN2 +/* + * Reset vector for R-Car Gen2 and RZ/G1 secondary CPUs. + * This will be mapped at address 0 by SBAR register. + */ +ENTRY(shmobile_boot_vector_gen2) + mrc p15, 0, r0, c0, c0, 5 @ r0 = MPIDR + ldr r1, shmobile_boot_cpu_gen2 + cmp r0, r1 + bne shmobile_smp_continue_gen2 + + mrc p15, 0, r1, c1, c0, 0 @ r1 = SCTLR + and r0, r1, #SCTLR_MMU + cmp r0, #SCTLR_MMU + beq shmobile_smp_continue_gen2 + + ldr r0, rwtcsra + mov r1, #0 + ldrb r1, [r0] + and r0, r1, #RWTCSRA_WOVF + cmp r0, #RWTCSRA_WOVF + bne shmobile_smp_continue_gen2 + + ldr r0, bootrom + bx r0 + +shmobile_smp_continue_gen2: + ldr r1, shmobile_boot_fn_gen2 + bx r1 + +ENDPROC(shmobile_boot_vector_gen2) + + .align 4 +rwtcsra: + .word RWTCSRA_ADDRESS +bootrom: + .word BOOTROM_ADDRESS + .globl shmobile_boot_cpu_gen2 +shmobile_boot_cpu_gen2: + .word 0x00000000 + + .align 2 + .globl shmobile_boot_fn_gen2 +shmobile_boot_fn_gen2: + .space 4 + .globl shmobile_boot_size_gen2 +shmobile_boot_size_gen2: + .long . - shmobile_boot_vector_gen2 +#endif /* CONFIG_ARCH_RCAR_GEN2 */ + /* * Per-CPU SMP boot function/argument selection code based on MPIDR */