From patchwork Wed Nov 16 13:49:08 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Fu Wei Fu X-Patchwork-Id: 82532 Delivered-To: patch@linaro.org Received: by 10.182.1.168 with SMTP id 8csp190923obn; Wed, 16 Nov 2016 05:52:39 -0800 (PST) X-Received: by 10.99.219.21 with SMTP id e21mr8386820pgg.136.1479304359493; Wed, 16 Nov 2016 05:52:39 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id p73si32007160pfl.79.2016.11.16.05.52.39 for ; Wed, 16 Nov 2016 05:52:39 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-watchdog-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-watchdog-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-watchdog-owner@vger.kernel.org; dmarc=fail (p=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932677AbcKPNwZ (ORCPT ); Wed, 16 Nov 2016 08:52:25 -0500 Received: from mx1.redhat.com ([209.132.183.28]:41766 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753282AbcKPNwU (ORCPT ); Wed, 16 Nov 2016 08:52:20 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id ED9BC12634; Wed, 16 Nov 2016 13:52:19 +0000 (UTC) Received: from Rei-Ayanami.localdomain.localdomain (vpn1-6-79.pek2.redhat.com [10.72.6.79]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id uAGDnN61003778; Wed, 16 Nov 2016 08:52:10 -0500 From: fu.wei@linaro.org To: rjw@rjwysocki.net, lenb@kernel.org, daniel.lezcano@linaro.org, tglx@linutronix.de, marc.zyngier@arm.com, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, sudeep.holla@arm.com, hanjun.guo@linaro.org Cc: linux-arm-kernel@lists.infradead.org, linaro-acpi@lists.linaro.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, rruigrok@codeaurora.org, harba@codeaurora.org, cov@codeaurora.org, timur@codeaurora.org, graeme.gregory@linaro.org, al.stone@linaro.org, jcm@redhat.com, wei@redhat.com, arnd@arndb.de, catalin.marinas@arm.com, will.deacon@arm.com, Suravee.Suthikulpanit@amd.com, leo.duran@amd.com, wim@iguana.be, linux@roeck-us.net, linux-watchdog@vger.kernel.org, tn@semihalf.com, christoffer.dall@linaro.org, julien.grall@arm.com, Fu Wei Subject: [PATCH v16 15/15] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver Date: Wed, 16 Nov 2016 21:49:08 +0800 Message-Id: <1479304148-2965-16-git-send-email-fu.wei@linaro.org> In-Reply-To: <1479304148-2965-1-git-send-email-fu.wei@linaro.org> References: <1479304148-2965-1-git-send-email-fu.wei@linaro.org> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Wed, 16 Nov 2016 13:52:20 +0000 (UTC) Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org From: Fu Wei This driver adds support for parsing SBSA Generic Watchdog timer in GTDT, parse all info in SBSA Generic Watchdog Structure in GTDT, and creating a platform device with that information. This allows the operating system to obtain device data from the resource of platform device. The platform device named "sbsa-gwdt" can be used by the ARM SBSA Generic Watchdog driver. Signed-off-by: Fu Wei Signed-off-by: Hanjun Guo Tested-by: Xiongfeng Wang --- drivers/acpi/arm64/gtdt.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++ drivers/watchdog/Kconfig | 1 + 2 files changed, 101 insertions(+) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c index 08d9506..69483f6 100644 --- a/drivers/acpi/arm64/gtdt.c +++ b/drivers/acpi/arm64/gtdt.c @@ -14,6 +14,7 @@ #include #include #include +#include #include @@ -66,6 +67,14 @@ static inline bool is_watchdog(void *platform_timer) return gh->type == ACPI_GTDT_TYPE_WATCHDOG; } +static inline struct acpi_gtdt_watchdog *get_watchdog(unsigned int index) +{ + if (index >= acpi_gtdt_desc.watchdog_count || !watchdog) + return NULL; + + return watchdog[index]; +} + static int __init map_gt_gsi(u32 interrupt, u32 flags) { int trigger, polarity; @@ -309,3 +318,94 @@ int __init gtdt_arch_timer_mem_init(struct arch_timer_mem *data, return 0; } + +/* + * Initialize a SBSA generic Watchdog platform device info from GTDT + */ +static int __init gtdt_import_sbsa_gwdt(struct acpi_gtdt_watchdog *wd, + int index) +{ + struct platform_device *pdev; + int irq = map_gt_gsi(wd->timer_interrupt, wd->timer_flags); + int no_irq = 1; + + /* + * According to SBSA specification the size of refresh and control + * frames of SBSA Generic Watchdog is SZ_4K(Offset 0x000 – 0xFFF). + */ + struct resource res[] = { + DEFINE_RES_MEM(wd->control_frame_address, SZ_4K), + DEFINE_RES_MEM(wd->refresh_frame_address, SZ_4K), + DEFINE_RES_IRQ(irq), + }; + + pr_debug("found a Watchdog (0x%llx/0x%llx gsi:%u flags:0x%x).\n", + wd->refresh_frame_address, wd->control_frame_address, + wd->timer_interrupt, wd->timer_flags); + + if (!(wd->refresh_frame_address && wd->control_frame_address)) { + pr_err(FW_BUG "failed to get the Watchdog base address.\n"); + return -EINVAL; + } + + if (!wd->timer_interrupt) + pr_warn(FW_BUG "failed to get the Watchdog interrupt.\n"); + else if (irq <= 0) + pr_warn("failed to map the Watchdog interrupt.\n"); + else + no_irq = 0; + + /* + * Add a platform device named "sbsa-gwdt" to match the platform driver. + * "sbsa-gwdt": SBSA(Server Base System Architecture) Generic Watchdog + * The platform driver (like drivers/watchdog/sbsa_gwdt.c)can get device + * info below by matching this name. + */ + pdev = platform_device_register_simple("sbsa-gwdt", index, res, + ARRAY_SIZE(res) - no_irq); + if (IS_ERR(pdev)) { + acpi_unregister_gsi(wd->timer_interrupt); + return PTR_ERR(pdev); + } + + return 0; +} + +static int __init gtdt_sbsa_gwdt_init(void) +{ + int i, ret; + struct acpi_table_header *table; + struct acpi_gtdt_watchdog *watchdog; + + if (acpi_disabled) + return 0; + + if (ACPI_FAILURE(acpi_get_table(ACPI_SIG_GTDT, 0, &table))) + return -EINVAL; + + ret = acpi_gtdt_init(table); + if (ret) + return ret; + + if (!acpi_gtdt_desc.watchdog_count) + return 0; + + for (i = 0; i < acpi_gtdt_desc.watchdog_count; i++) { + watchdog = get_watchdog(i); + if (!watchdog) { + ret = -ENODEV; + break; + } + ret = gtdt_import_sbsa_gwdt(watchdog, i); + if (ret) + break; + } + + pr_info("found %d SBSA generic Watchdog(s), %d imported.\n", + acpi_gtdt_desc.watchdog_count, i); + + acpi_gtdt_release(); + return ret; +} + +device_initcall(gtdt_sbsa_gwdt_init); diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index fdd3228..e5ba1f0 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -218,6 +218,7 @@ config ARM_SBSA_WATCHDOG tristate "ARM SBSA Generic Watchdog" depends on ARM64 depends on ARM_ARCH_TIMER + depends on ACPI_GTDT || !ACPI select WATCHDOG_CORE help ARM SBSA Generic Watchdog has two stage timeouts: