diff options
| author | Marc Zyngier <maz@kernel.org> | 2025-08-14 16:46:22 +0100 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2025-09-23 12:32:08 +0200 |
| commit | 4e9bfe6969a768ef40c669fd100c9be70fb78a1f (patch) | |
| tree | a31210b3ed26ac757774829ab4b2a6fb025f306a /drivers/clocksource/arm_arch_timer_mmio.c | |
| parent | 0f67b56d84b4c49adfd61f19f81f84ec613ab51a (diff) | |
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
Diffstat (limited to 'drivers/clocksource/arm_arch_timer_mmio.c')
| -rw-r--r-- | drivers/clocksource/arm_arch_timer_mmio.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/clocksource/arm_arch_timer_mmio.c b/drivers/clocksource/arm_arch_timer_mmio.c index 3522d1d8cb97..ebe1987d651e 100644 --- a/drivers/clocksource/arm_arch_timer_mmio.c +++ b/drivers/clocksource/arm_arch_timer_mmio.c @@ -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, |