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clocksource/drivers/sprd: Enable register for timer counter from 32 bit to 64 bit

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Using 32 bit for suspend compensation, the max compensation time is 36
hours(working clock is 32k).In some IOT devices, the suspend time may
be long, even exceeding 36 hours. Therefore, a 64 bit timer counter
is needed for counting.

Signed-off-by: Enlin Mu <enlin.mu@unisoc.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Link: https://patch.msgid.link/20251106021830.34846-1-enlin.mu@linux.dev
This commit is contained in:
Enlin Mu
2025-11-06 10:18:30 +08:00
committed by Daniel Lezcano
parent dcb6fa37fd
commit 576c564ec3
1 changed files with 18 additions and 6 deletions
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24
drivers/clocksource/timer-sprd.c
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@@ -30,6 +30,7 @@
#define TIMER_VALUE_SHDW_HI 0x1c
#define TIMER_VALUE_LO_MASK GENMASK(31, 0)
#define TIMER_VALUE_HI_MASK GENMASK(31, 0)
static void sprd_timer_enable(void __iomem *base, u32 flag)
{
@@ -162,15 +163,26 @@ static struct timer_of suspend_to = {
static u64 sprd_suspend_timer_read(struct clocksource *cs)
{
return ~(u64)readl_relaxed(timer_of_base(&suspend_to) +
TIMER_VALUE_SHDW_LO) & cs->mask;
u32 lo, hi;
do {
hi = readl_relaxed(timer_of_base(&suspend_to) +
TIMER_VALUE_SHDW_HI);
lo = readl_relaxed(timer_of_base(&suspend_to) +
TIMER_VALUE_SHDW_LO);
} while (hi != readl_relaxed(timer_of_base(&suspend_to) + TIMER_VALUE_SHDW_HI));
return ~(((u64)hi << 32) | lo);
}
static int sprd_suspend_timer_enable(struct clocksource *cs)
{
sprd_timer_update_counter(timer_of_base(&suspend_to),
TIMER_VALUE_LO_MASK);
sprd_timer_enable(timer_of_base(&suspend_to), TIMER_CTL_PERIOD_MODE);
writel_relaxed(TIMER_VALUE_LO_MASK,
timer_of_base(&suspend_to) + TIMER_LOAD_LO);
writel_relaxed(TIMER_VALUE_HI_MASK,
timer_of_base(&suspend_to) + TIMER_LOAD_HI);
sprd_timer_enable(timer_of_base(&suspend_to),
TIMER_CTL_PERIOD_MODE|TIMER_CTL_64BIT_WIDTH);
return 0;
}
@@ -186,7 +198,7 @@ static struct clocksource suspend_clocksource = {
.read = sprd_suspend_timer_read,
.enable = sprd_suspend_timer_enable,
.disable = sprd_suspend_timer_disable,
.mask = CLOCKSOURCE_MASK(32),
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS | CLOCK_SOURCE_SUSPEND_NONSTOP,
};