From 62c544bc108caa4ce68bfb9864a2500c4480ff56 Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Fri, 6 Feb 2026 21:59:56 +0100 Subject: [PATCH] parisc: Detect 64-bit free running platform counter Signed-off-by: Helge Deller --- arch/parisc/kernel/time.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/parisc/kernel/time.c b/arch/parisc/kernel/time.c index c17e2249115f5..94dc48455dc67 100644 --- a/arch/parisc/kernel/time.c +++ b/arch/parisc/kernel/time.c @@ -16,6 +16,7 @@ #include #include #include +#include static u64 cr16_clock_freq; static unsigned long clocktick; @@ -99,6 +100,22 @@ void parisc_clockevent_init(void) clockevents_config_and_register(cd, cr16_clock_freq, min_delta, max_delta); } +static void parisc_find_64bit_counter(void) +{ +#ifdef CONFIG_64BIT + uint64_t *pclock; + unsigned long freq, unique; + int ret; + + ret = pdc_pat_pd_get_platform_counter(&pclock, &freq, &unique); + if (ret == PDC_OK) + pr_info("64-bit counter found at %px, freq: %lu, unique: %lu\n", + pclock, freq, unique); + else + pr_info("64-bit counter not found.\n"); +#endif +} + unsigned long notrace profile_pc(struct pt_regs *regs) { unsigned long pc = instruction_pointer(regs); @@ -213,6 +230,9 @@ void __init time_init(void) parisc_clockevent_init(); + /* check for free-running 64-bit platform counter */ + parisc_find_64bit_counter(); + /* register at clocksource framework */ clocksource_register_hz(&clocksource_cr16, cr16_clock_freq); } -- 2.47.3