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authorYingjoe Chen <yingjoe.chen@mediatek.com>2015-07-13 17:32:46 +0800
committerDaniel Lezcano <daniel.lezcano@linaro.org>2015-10-15 17:41:58 +0200
commitf14665f63b92f958636b7e7610ec2c9726ea9335 (patch)
treeb85c1abb2cb58ec9982c665b3c2fbf2f669f6fec /drivers/clocksource
parentfc686d0037d782c994e338ecb01bfef8bbafff9f (diff)
clocksource/drivers/mediatek: Use GPT as sched clock source
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 <yingjoe.chen@mediatek.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Stephen Boyd <sboyd@codeaurora.org> Acked-by: Matthias Brugger <matthias.bgg@gmail.com>
Diffstat (limited to 'drivers/clocksource')
-rw-r--r--drivers/clocksource/mtk_timer.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/clocksource/mtk_timer.c b/drivers/clocksource/mtk_timer.c
index c8badc427eec..fbfc74685e6a 100644
--- a/drivers/clocksource/mtk_timer.c
+++ b/drivers/clocksource/mtk_timer.c
@@ -24,6 +24,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
+#include <linux/sched_clock.h>
#include <linux/slab.h>
#define GPT_IRQ_EN_REG 0x00
@@ -59,6 +60,13 @@ struct mtk_clock_event_device {
struct clock_event_device dev;
};
+static void __iomem *gpt_sched_reg __read_mostly;
+
+static u64 notrace mtk_read_sched_clock(void)
+{
+ return readl_relaxed(gpt_sched_reg);
+}
+
static inline struct mtk_clock_event_device *to_mtk_clk(
struct clock_event_device *c)
{
@@ -230,6 +238,8 @@ static void __init mtk_timer_init(struct device_node *node)
mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN);
clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC),
node->name, rate, 300, 32, clocksource_mmio_readl_up);
+ gpt_sched_reg = evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC);
+ sched_clock_register(mtk_read_sched_clock, 32, rate);
/* Configure clock event */
mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT);