Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751490AbeAIJJw (ORCPT + 1 other); Tue, 9 Jan 2018 04:09:52 -0500 Received: from mail-pg0-f67.google.com ([74.125.83.67]:37722 "EHLO mail-pg0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751008AbeAIJJp (ORCPT ); Tue, 9 Jan 2018 04:09:45 -0500 X-Google-Smtp-Source: ACJfBouCloHW5Z0TJnFiK+buApQp9FzZEkehS+roy2HdJBVJ7r+0xG8LsVtYHderO40Oq3nKnPgZ4A== From: Baolin Wang To: daniel.lezcano@linaro.org, tglx@linutronix.de Cc: broonie@kernel.org, arnd@arndb.de, baolin.wang@linaro.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] clocksource: sprd: Add one persistent timer for Spreadtrum SC9860 platform Date: Tue, 9 Jan 2018 17:09:11 +0800 Message-Id: <3dd35afbcc2bc69bbc7a625e56257435b22dbc4c.1515486685.git.baolin.wang@linaro.org> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: On Spreadtrum SC9860 platform, we need one persistent timer to calculate the suspend time to compensate the OS time. This patch registers one Spreadtrum AON timer as persistent timer, which runs at 32bit and periodic mode. Signed-off-by: Baolin Wang --- drivers/clocksource/Kconfig | 1 + drivers/clocksource/timer-sprd.c | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 9cf3d41..322c02d 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -448,6 +448,7 @@ config SPRD_TIMER bool "Spreadtrum timer driver" if COMPILE_TEST depends on HAS_IOMEM select TIMER_OF + select PERSISTENT_TIMER help Enables the support for the Spreadtrum timer driver. diff --git a/drivers/clocksource/timer-sprd.c b/drivers/clocksource/timer-sprd.c index ef9ebea..2304a7c 100644 --- a/drivers/clocksource/timer-sprd.c +++ b/drivers/clocksource/timer-sprd.c @@ -7,6 +7,7 @@ #include #include "timer-of.h" +#include "persistent-timer.h" #define TIMER_NAME "sprd_timer" @@ -157,3 +158,37 @@ static int __init sprd_timer_init(struct device_node *np) } TIMER_OF_DECLARE(sc9860_timer, "sprd,sc9860-timer", sprd_timer_init); + +static u64 sprd_persistent_timer_read(struct persistent_timer *p) +{ + return ~(u64)readl_relaxed(p->base + TIMER_VALUE_SHDW_LO) & p->mask; +} + +static void sprd_persistent_timer_enable(struct persistent_timer *p) +{ + sprd_timer_disable(p->base); + sprd_timer_update_counter(p->base, TIMER_VALUE_LO_MASK); + sprd_timer_enable(p->base, TIMER_CTL_PERIOD_MODE); +} + +static struct persistent_timer p = { + .read = sprd_persistent_timer_read, + .mask = CLOCKSOURCE_MASK(32), + .flags = PERSISTENT_TIMER_BASE | PERSISTENT_TIMER_CLOCK | + PERSISTENT_TIMER_MULT_SHIFT, +}; + +static int __init sprd_persistent_timer_init(struct device_node *np) +{ + int ret; + + ret = persistent_timer_init_and_register(np, &p); + if (ret) + return ret; + + sprd_persistent_timer_enable(&p); + return 0; +} + +TIMER_OF_DECLARE(sc9860_persistent_timer, "sprd,sc9860-persistent-timer", + sprd_persistent_timer_init); -- 1.7.9.5