Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756200AbaFLP7K (ORCPT ); Thu, 12 Jun 2014 11:59:10 -0400 Received: from hqemgate16.nvidia.com ([216.228.121.65]:3298 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753088AbaFLP7G (ORCPT ); Thu, 12 Jun 2014 11:59:06 -0400 X-PGP-Universal: processed; by hqnvupgp08.nvidia.com on Thu, 12 Jun 2014 08:53:47 -0700 From: Peter De Schrijver To: Peter De Schrijver CC: Russell King , Daniel Lezcano , Thomas Gleixner , Stephen Warren , Thierry Reding , Paul Gortmaker , , , Subject: [PATCH v2 3/3] clocksource: tegra: Use us counter as delay timer Date: Thu, 12 Jun 2014 18:58:29 +0300 Message-ID: <1402588713-18766-4-git-send-email-pdeschrijver@nvidia.com> X-Mailer: git-send-email 1.7.7.rc0.72.g4b5ea.dirty In-Reply-To: <1402588713-18766-1-git-send-email-pdeschrijver@nvidia.com> References: <1402588713-18766-1-git-send-email-pdeschrijver@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org All Tegra SoCs have a freerunning microsecond counter which can be used as a delay timer. Signed-off-by: Peter De Schrijver --- drivers/clocksource/tegra20_timer.c | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/drivers/clocksource/tegra20_timer.c b/drivers/clocksource/tegra20_timer.c index d1869f0..d2616ef 100644 --- a/drivers/clocksource/tegra20_timer.c +++ b/drivers/clocksource/tegra20_timer.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include @@ -53,6 +54,8 @@ static void __iomem *rtc_base; static struct timespec persistent_ts; static u64 persistent_ms, last_persistent_ms; +static struct delay_timer tegra_delay_timer; + #define timer_writel(value, reg) \ __raw_writel(value, timer_reg_base + (reg)) #define timer_readl(reg) \ @@ -139,6 +142,11 @@ static void tegra_read_persistent_clock(struct timespec *ts) *ts = *tsp; } +static unsigned long tegra_delay_timer_read_counter_long(void) +{ + return readl(timer_reg_base + TIMERUS_CNTR_1US); +} + static irqreturn_t tegra_timer_interrupt(int irq, void *dev_id) { struct clock_event_device *evt = (struct clock_event_device *)dev_id; @@ -206,6 +214,11 @@ static void __init tegra20_init_timer(struct device_node *np) BUG(); } + tegra_delay_timer.read_current_timer = + tegra_delay_timer_read_counter_long; + tegra_delay_timer.freq = 1000000; + register_current_timer_delay(&tegra_delay_timer); + ret = setup_irq(tegra_timer_irq.irq, &tegra_timer_irq); if (ret) { pr_err("Failed to register timer IRQ: %d\n", ret); -- 1.7.7.rc0.72.g4b5ea.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/