Commit f14665f6 authored by Yingjoe Chen's avatar Yingjoe Chen Committed by Daniel Lezcano

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: default avatarYingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Acked-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Acked-by: default avatarMatthias Brugger <matthias.bgg@gmail.com>
parent fc686d00
...@@ -24,6 +24,7 @@ ...@@ -24,6 +24,7 @@
#include <linux/of.h> #include <linux/of.h>
#include <linux/of_address.h> #include <linux/of_address.h>
#include <linux/of_irq.h> #include <linux/of_irq.h>
#include <linux/sched_clock.h>
#include <linux/slab.h> #include <linux/slab.h>
#define GPT_IRQ_EN_REG 0x00 #define GPT_IRQ_EN_REG 0x00
...@@ -59,6 +60,13 @@ struct mtk_clock_event_device { ...@@ -59,6 +60,13 @@ struct mtk_clock_event_device {
struct clock_event_device dev; 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( static inline struct mtk_clock_event_device *to_mtk_clk(
struct clock_event_device *c) struct clock_event_device *c)
{ {
...@@ -230,6 +238,8 @@ static void __init mtk_timer_init(struct device_node *node) ...@@ -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); mtk_timer_setup(evt, GPT_CLK_SRC, TIMER_CTRL_OP_FREERUN);
clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC), clocksource_mmio_init(evt->gpt_base + TIMER_CNT_REG(GPT_CLK_SRC),
node->name, rate, 300, 32, clocksource_mmio_readl_up); 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 */ /* Configure clock event */
mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT); mtk_timer_setup(evt, GPT_CLK_EVT, TIMER_CTRL_OP_REPEAT);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment