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clocksource/drivers/arm_arch_timer_mmio: Add MMIO clocksource 

The MMIO driver can also double as a clocksource, something that was
missing in its previous incarnation. Add it for completeness.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Link: https://lore.kernel.org/r/20250814154622.10193-5-maz@kernel.org
This commit is contained in:
Marc Zyngier 2025-08-14 16:46:22 +01:00 committed by Daniel Lezcano
parent 0f67b56d84
commit 4e9bfe6969
1 changed files with 19 additions and 0 deletions
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19
drivers/clocksource/arm_arch_timer_mmio.c
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@ -45,6 +45,7 @@ enum arch_timer_access {
struct arch_timer {
struct clock_event_device evt;
struct clocksource cs;
struct arch_timer_mem *gt_block;
void __iomem *base;
enum arch_timer_access access;
@ -52,6 +53,7 @@ struct arch_timer {
};
#define evt_to_arch_timer(e) container_of(e, struct arch_timer, evt)
#define cs_to_arch_timer(c) container_of(c, struct arch_timer, cs)
static void arch_timer_mmio_write(struct arch_timer *timer,
enum arch_timer_reg reg, u64 val)
@ -128,6 +130,13 @@ static noinstr u64 arch_counter_mmio_get_cnt(struct arch_timer *t)
return ((u64) cnt_hi << 32) | cnt_lo;
}
static u64 arch_mmio_counter_read(struct clocksource *cs)
{
struct arch_timer *at = cs_to_arch_timer(cs);
return arch_counter_mmio_get_cnt(at);
}
static int arch_timer_mmio_shutdown(struct clock_event_device *clk)
{
struct arch_timer *at = evt_to_arch_timer(clk);
@ -256,6 +265,16 @@ static void arch_timer_mmio_setup(struct arch_timer *at, int irq)
(unsigned long)CLOCKSOURCE_MASK(56));
enable_irq(at->evt.irq);
at->cs = (struct clocksource) {
.name = "arch_mmio_counter",
.rating = 300,
.read = arch_mmio_counter_read,
.mask = CLOCKSOURCE_MASK(56),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
clocksource_register_hz(&at->cs, at->rate);
}
static int arch_timer_mmio_frame_register(struct platform_device *pdev,