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parisc: Detect 64-bit free running platform counter

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Signed-off-by: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller
2026-02-06 21:59:56 +01:00
parent e3217ddf29
commit 62c544bc10
1 changed files with 20 additions and 0 deletions
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20
arch/parisc/kernel/time.c
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@@ -16,6 +16,7 @@
#include <linux/rtc.h>
#include <linux/platform_device.h>
#include <asm/processor.h>
#include <asm/pdcpat.h>
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);
}