From patchwork Wed Sep 28 18:17:14 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fu Wei Fu X-Patchwork-Id: 77089 Delivered-To: patch@linaro.org Received: by 10.140.106.72 with SMTP id d66csp577540qgf; Wed, 28 Sep 2016 11:18:59 -0700 (PDT) X-Received: by 10.98.208.195 with SMTP id p186mr58448224pfg.90.1475086738953; Wed, 28 Sep 2016 11:18:58 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id cj9si9588038pad.252.2016.09.28.11.18.58 for ; Wed, 28 Sep 2016 11:18:58 -0700 (PDT) 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; dkim=neutral (body hash did not verify) header.i=@linaro.org; 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 S932271AbcI1SSu (ORCPT ); Wed, 28 Sep 2016 14:18:50 -0400 Received: from mail-pa0-f50.google.com ([209.85.220.50]:35439 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753463AbcI1SSm (ORCPT ); Wed, 28 Sep 2016 14:18:42 -0400 Received: by mail-pa0-f50.google.com with SMTP id oz2so19048206pac.2 for ; Wed, 28 Sep 2016 11:18:41 -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; bh=L0bmYUsPgZ/Stc1pDNHuM2WkgoTeOQ8U8yD22oaN+9w=; b=e6NYUh6KLnkoxQ0FlZT3V2dPaKP2UkgrZcqKWxM+BBCVAH6H9ci7RafmK0dLuqAPVQ NiOkTEDldH0uj4H6rJjqOM0NEMkp9rh1mwQoft1XViZmUSSQuiLkjn/Kyj8pqN4uhCxT UqVuBFC9A0DkmBfDurGCC6ur2JOCSJl0tipp4= 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; bh=L0bmYUsPgZ/Stc1pDNHuM2WkgoTeOQ8U8yD22oaN+9w=; b=kLXeUpfUCrCP8gWlM1ecdOCM97IxKPugKfPIadhYGiKaj4s4bbHyPxNFzRcWTyvs0f gfPJOE+ed9BrM7RqZwlXFtOUgfYrKWVzJ2+8czXZvBbZvv0GxBNayGJ8nYoeFalsPl0G rrHi98KlC/buh1hzMseABssm5a73DEmEt8lAKEhp+IJ6oIqinsoXkN/0kYqbkYAlL8l/ 0JO0l9Jae4ve7Ioja6ZW0c8vHAudNECMdhSs7GAdn/PPDKGGaRETLBUJ04qcyz6nqSp6 ZD/DHnIJj8JxcOvBo0zYSqirjx2y78Mb+KWQpUr4QjNjnXl8uH6LSUwRO2QJkTwLrFvo Tx2w== X-Gm-Message-State: AE9vXwO03OfViFvrRGWz7qKM580E/Zo0O+5two6708p6SH9DPQxP8QFMwPlKnGCAWz3TXfCH X-Received: by 10.66.145.73 with SMTP id ss9mr60136730pab.82.1475086720945; Wed, 28 Sep 2016 11:18:40 -0700 (PDT) Received: from Rei-Ayanami.localdomain.localdomain ([67.238.99.186]) by smtp.googlemail.com with ESMTPSA id ak3sm14226365pad.19.2016.09.28.11.18.38 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 28 Sep 2016 11:18:40 -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 v14 6/9] acpi/arm64: Add memory-mapped timer support in GTDT driver Date: Thu, 29 Sep 2016 02:17:14 +0800 Message-Id: <1475086637-1914-7-git-send-email-fu.wei@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1475086637-1914-1-git-send-email-fu.wei@linaro.org> References: <1475086637-1914-1-git-send-email-fu.wei@linaro.org> Sender: linux-watchdog-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org From: Fu Wei On platforms booting with ACPI, architected memory-mapped timers' configuration data is provided by firmware through the ACPI GTDT static table. The clocksource architected timer kernel driver requires a firmware interface to collect timer configuration and configure its driver. this infrastructure is present for device tree systems, but it is missing on systems booting with ACPI. Implement the kernel infrastructure required to parse the static ACPI GTDT table so that the architected timer clocksource driver can make use of it on systems booting with ACPI, therefore enabling the corresponding timers configuration. Signed-off-by: Fu Wei Signed-off-by: Hanjun Guo --- drivers/acpi/arm64/gtdt.c | 70 ++++++++++++++++++++++++++++++++++++ include/clocksource/arm_arch_timer.h | 15 ++++++++ include/linux/acpi.h | 1 + 3 files changed, 86 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 b24844d..b6021db 100644 --- a/drivers/acpi/arm64/gtdt.c +++ b/drivers/acpi/arm64/gtdt.c @@ -150,3 +150,73 @@ int __init acpi_gtdt_init(struct acpi_table_header *table) return gtdt->platform_timer_count; } + +static int __init gtdt_parse_gt_block(struct acpi_gtdt_timer_block *block, + struct gt_block_data *data) +{ + struct acpi_gtdt_timer_entry *frame; + int i; + + if (!block || !data) + return -EINVAL; + + if (!block->block_address || !block->timer_count) + return -EINVAL; + + data->cntctlbase_phy = (phys_addr_t)block->block_address; + data->timer_count = block->timer_count; + + frame = (void *)block + block->timer_offset; + if (frame + block->timer_count != (void *)block + block->header.length) + return -EINVAL; + + /* + * Get the GT timer Frame data for every GT Block Timer + */ + for (i = 0; i < block->timer_count; i++, frame++) { + if (!frame->base_address || !frame->timer_interrupt) + return -EINVAL; + + data->timer[i].irq = map_gt_gsi(frame->timer_interrupt, + frame->timer_flags); + if (data->timer[i].irq <= 0) + return -EINVAL; + + if (frame->virtual_timer_interrupt) { + data->timer[i].virtual_irq = + map_gt_gsi(frame->virtual_timer_interrupt, + frame->virtual_timer_flags); + if (data->timer[i].virtual_irq <= 0) + return -EINVAL; + } + + data->timer[i].frame_nr = frame->frame_number; + data->timer[i].cntbase_phy = frame->base_address; + } + + return 0; +} + +/* + * Get the GT block info for memory-mapped timer from GTDT table. + */ +int __init gtdt_arch_timer_mem_init(struct gt_block_data *data) +{ + void *platform_timer; + int index = 0; + int ret; + + for_each_platform_timer(platform_timer) { + if (!is_timer_block(platform_timer)) + continue; + ret = gtdt_parse_gt_block(platform_timer, data + index); + if (ret) + return ret; + index++; + } + + if (index) + pr_info("found %d memory-mapped timer block(s).\n", index); + + return index; +} diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h index 16dcd10..94a5d14 100644 --- a/include/clocksource/arm_arch_timer.h +++ b/include/clocksource/arm_arch_timer.h @@ -56,6 +56,8 @@ enum spi_nr { #define ARCH_TIMER_MEM_PHYS_ACCESS 2 #define ARCH_TIMER_MEM_VIRT_ACCESS 3 +#define ARCH_TIMER_MEM_MAX_FRAME 8 + #define ARCH_TIMER_USR_PCT_ACCESS_EN (1 << 0) /* physical counter */ #define ARCH_TIMER_USR_VCT_ACCESS_EN (1 << 1) /* virtual counter */ #define ARCH_TIMER_VIRT_EVT_EN (1 << 2) @@ -71,6 +73,19 @@ struct arch_timer_kvm_info { int virtual_irq; }; +struct gt_timer_data { + int frame_nr; + phys_addr_t cntbase_phy; + int irq; + int virtual_irq; +}; + +struct gt_block_data { + phys_addr_t cntctlbase_phy; + int timer_count; + struct gt_timer_data timer[ARCH_TIMER_MEM_MAX_FRAME]; +}; + #ifdef CONFIG_ARM_ARCH_TIMER extern u32 arch_timer_get_rate(void); diff --git a/include/linux/acpi.h b/include/linux/acpi.h index e2f9841..5dc0b85 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -571,6 +571,7 @@ int acpi_reconfig_notifier_unregister(struct notifier_block *nb); int acpi_gtdt_init(struct acpi_table_header *table); int acpi_gtdt_map_ppi(int type); bool acpi_gtdt_c3stop(void); +int gtdt_arch_timer_mem_init(struct gt_block_data *data); #endif #else /* !CONFIG_ACPI */