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[209.132.180.67]) by mx.google.com with ESMTP id h84si34985857pfh.47.2016.09.14.13.13.31; Wed, 14 Sep 2016 13:13:32 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765831AbcINUN3 (ORCPT + 27 others); Wed, 14 Sep 2016 16:13:29 -0400 Received: from mail-wm0-f44.google.com ([74.125.82.44]:36986 "EHLO mail-wm0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1765661AbcINUMy (ORCPT ); Wed, 14 Sep 2016 16:12:54 -0400 Received: by mail-wm0-f44.google.com with SMTP id k186so28911994wmd.0 for ; Wed, 14 Sep 2016 13:12:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=2Y7ngvuEy0yrkczHL2WrPKaYY0jiRBEHGfGXso5rV2I=; b=HBKZod8Kh0FKkThPi4U2ZlMYNQMvQBhBKTkHSKdUOaxZdTHD6e4EdQOF47TVo+xrVH kL1/KF5B2n/5RodiNGdpMEHzEatr5gUUkGGMpesSkM0uUQzCapK6b7TU9ePXdCu9k/d7 EY3U0AQanqmApCBVyFG5JOS8fuJ4DlFhY3pno= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=2Y7ngvuEy0yrkczHL2WrPKaYY0jiRBEHGfGXso5rV2I=; b=iAkw2eviBeZi+34hrI1p7dl0BK4VB4viFEWRJob7fPsGP/fwFiWx26yHLSoP1FTJdq rhhFcg67SgxJEIrgzeMT9WRI+O0u6gamAPZ2+k+X9hkLG34ldgNC8e5VA2KGq8WLKL+4 6oFZZRoEz4qXOhEhvUlLOZJRn8Pawc2VNM8Nh+3elqmvYKs4otqcuLJfeN5G8hAGP4ku +I0dEsWC5KRLIyz+bk1htBJY9krc7jvBmBN99k/X4kForJrlI7m372ibN1g/BP4vI5d0 zLtX25+/M/WcdL3kz9XPcMw13HGD8tQKm43Lgv135AlUh77umwkBvMWFlxSoVq7+lcNh +chw== X-Gm-Message-State: AE9vXwOQjGVSC/1VHt9TWzvHIFPeXJHLnagYonWBNEuwKos6SuWJYePZAcq7nmkpLHooNm81 X-Received: by 10.28.214.130 with SMTP id n124mr4695175wmg.37.1473883953240; Wed, 14 Sep 2016 13:12:33 -0700 (PDT) Received: from Rei-Ayanami.localdomain.com ([59.58.254.106]) by smtp.googlemail.com with ESMTPSA id ab9sm1233449wjc.7.2016.09.14.13.12.22 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 14 Sep 2016 13:12:32 -0700 (PDT) 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 v13 8/8] acpi/arm64: Add SBSA Generic Watchdog support in GTDT driver Date: Thu, 15 Sep 2016 04:09:41 +0800 Message-Id: <1473883781-9571-9-git-send-email-fu.wei@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1473883781-9571-1-git-send-email-fu.wei@linaro.org> References: <1473883781-9571-1-git-send-email-fu.wei@linaro.org> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 --- drivers/acpi/arm64/gtdt.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/watchdog/Kconfig | 1 + 2 files changed, 88 insertions(+) -- 2.7.4 diff --git a/drivers/acpi/arm64/gtdt.c b/drivers/acpi/arm64/gtdt.c index b6021db..6d9fdd3 100644 --- a/drivers/acpi/arm64/gtdt.c +++ b/drivers/acpi/arm64/gtdt.c @@ -14,6 +14,7 @@ #include #include #include +#include #include @@ -220,3 +221,89 @@ int __init gtdt_arch_timer_mem_init(struct gt_block_data *data) return index; } + +/* + * 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) +{ + struct acpi_table_header *table; + void *platform_timer; + int index = 0; + int ret; + + 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 <= 0) + return ret; + + for_each_platform_timer(platform_timer) { + if (!is_watchdog(platform_timer)) + continue; + ret = gtdt_import_sbsa_gwdt(platform_timer, index); + if (ret) + break; + index++; + } + + if (index) + pr_info("found %d SBSA generic Watchdog(s).\n", index); + + return ret; +} + +device_initcall(gtdt_sbsa_gwdt_init); diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig index 1bffe00..341964a 100644 --- a/drivers/watchdog/Kconfig +++ b/drivers/watchdog/Kconfig @@ -205,6 +205,7 @@ 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: