From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yingjoe Chen Subject: [PATCH v2 4/9] clocksource: mediatek: Use GPT as sched clock source Date: Sat, 16 May 2015 15:58:25 +0800 Message-ID: <1431763110-443-5-git-send-email-yingjoe.chen@mediatek.com> References: <1431763110-443-1-git-send-email-yingjoe.chen@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1431763110-443-1-git-send-email-yingjoe.chen@mediatek.com> Sender: linux-kernel-owner@vger.kernel.org To: Mark Rutland , Matthias Brugger , Thomas Gleixner , Russell King Cc: Arnd Bergmann , Olof Johansson , devicetree@vger.kernel.org, Stephen Boyd , Pawel Moll , Catalin Marinas , Daniel Lezcano , linux-kernel@vger.kernel.org, Marc Carino , Rob Herring , linux-mediatek@lists.infradead.org, Sascha Hauer , Yingjoe Chen , srv_heupstream@mediatek.com, linux-arm-kernel@lists.infradead.org List-Id: devicetree@vger.kernel.org When cpu is in deep idle, arch timer will stop counting. Setup GPT as sched clock source so it can keep counting in idle. Signed-off-by: Yingjoe Chen --- drivers/clocksource/mtk_timer.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c index 91206f9..fe7cf72 100644 --- a/drivers/clocksource/mtk_timer.c +++ b/drivers/clocksource/mtk_timer.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #define GPT_IRQ_EN_REG 0x00 @@ -59,6 +60,13 @@ struct mtk_clock_event_device { struct clock_event_device dev; }; +static void __iomem *gpt_base __read_mostly; + +static u64 notrace mtk_read_sched_clock(void) +{ + return readl_relaxed(gpt_base + TIMER_CNT_REG(GPT_CLK_SRC)); +} + static inline struct mtk_clock_event_device *to_mtk_clk( struct clock_event_device *c) { @@ -243,6 +251,8 @@ static void __init mtk_timer_init(struct device_node *node) mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN, 1); clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC), node->name, rate, 300, 32, clocksource_mmio_readl_up); + gpt_base = evt->gpt_base; + sched_clock_register(mtk_read_sched_clock, 32, rate); /* Configure clock event */ mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT, 0); -- 1.8.1.1.dirty