From patchwork Wed Nov 26 21:52:30 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dave Gerlach X-Patchwork-Id: 5388791 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 356ED9F2F5 for ; Wed, 26 Nov 2014 21:56:28 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4DE992018E for ; Wed, 26 Nov 2014 21:56:27 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6C95520160 for ; Wed, 26 Nov 2014 21:56:26 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XtkXB-0000qT-OF; Wed, 26 Nov 2014 21:54:01 +0000 Received: from comal.ext.ti.com ([198.47.26.152]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XtkWO-00005D-Ly for linux-arm-kernel@lists.infradead.org; Wed, 26 Nov 2014 21:53:14 +0000 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id sAQLqlH9004403; Wed, 26 Nov 2014 15:52:47 -0600 Received: from DFLE72.ent.ti.com (dfle72.ent.ti.com [128.247.5.109]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id sAQLqlSc014183; Wed, 26 Nov 2014 15:52:47 -0600 Received: from dlep33.itg.ti.com (157.170.170.75) by DFLE72.ent.ti.com (128.247.5.109) with Microsoft SMTP Server id 14.3.174.1; Wed, 26 Nov 2014 15:52:47 -0600 Received: from legion.dal.design.ti.com (legion.dal.design.ti.com [128.247.22.53]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id sAQLqlK1020799; Wed, 26 Nov 2014 15:52:47 -0600 Received: from localhost (j-172-22-146-2.vpn.ti.com [172.22.146.2]) by legion.dal.design.ti.com (8.11.7p1+Sun/8.11.7) with ESMTP id sAQLqft16838; Wed, 26 Nov 2014 15:52:42 -0600 (CST) From: Dave Gerlach To: , , Subject: [RFC PATCH v5 1/4] ARM: OMAP2+: timer: Add suspend-resume callbacks for clkevent device Date: Wed, 26 Nov 2014 15:52:30 -0600 Message-ID: X-Mailer: git-send-email 2.1.0 In-Reply-To: References: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20141126_135312_868067_6481D278 X-CRM114-Status: GOOD ( 11.72 ) X-Spam-Score: -5.0 (-----) Cc: Paul Walmsley , Kevin Hilman , Dave Gerlach , Tony Lindgren , Vaibhav Bedia , Benoit Cousson X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_LOW, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Vaibhav Bedia OMAP timer code registers two timers - one as clocksource and one as clockevent. Since AM33XX has only one usable timer in the WKUP domain one of the timers needs suspend-resume support to restore the configuration to pre-suspend state. commit adc78e6b9946 ("timekeeping: Add suspend and resume of clock event devices") introduced .suspend and .resume callbacks for clock event devices. Leverage these callbacks to have AM33XX clockevent timer behave properly across system suspend. Signed-off-by: Vaibhav Bedia Signed-off-by: Dave Gerlach --- arch/arm/mach-omap2/timer.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c index 4f61148..5c7ecde 100644 --- a/arch/arm/mach-omap2/timer.c +++ b/arch/arm/mach-omap2/timer.c @@ -67,6 +67,9 @@ static struct omap_dm_timer clkev; static struct clock_event_device clockevent_gpt; +/* Clockevent hwmod for am335x and am437x suspend */ +struct omap_hwmod *clockevent_gpt_hwmod; + #ifdef CONFIG_SOC_HAS_REALTIME_COUNTER static unsigned long arch_timer_freq; @@ -128,6 +131,23 @@ static void omap2_gp_timer_set_mode(enum clock_event_mode mode, } } +static void omap_clkevt_idle(struct clock_event_device *unused) +{ + if (!clockevent_gpt_hwmod) + return; + + omap_hwmod_idle(clockevent_gpt_hwmod); +} + +static void omap_clkevt_unidle(struct clock_event_device *unused) +{ + if (!clockevent_gpt_hwmod) + return; + + omap_hwmod_enable(clockevent_gpt_hwmod); + __omap_dm_timer_int_enable(&clkev, OMAP_TIMER_INT_OVERFLOW); +} + static struct clock_event_device clockevent_gpt = { .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, .rating = 300, @@ -355,6 +375,14 @@ static void __init omap2_gp_clockevent_init(int gptimer_id, 3, /* Timer internal resynch latency */ 0xffffffff); + if (soc_is_am33xx()) { + clockevent_gpt.suspend = omap_clkevt_idle; + clockevent_gpt.resume = omap_clkevt_unidle; + + clockevent_gpt_hwmod = + omap_hwmod_lookup(clockevent_gpt.name); + } + pr_info("OMAP clockevent source: %s at %lu Hz\n", clockevent_gpt.name, clkev.rate); }