Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
parisc: Detect 64-bit free running platform counter
Signed-off-by: Helge Deller <deller@gmx.de>
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arch/parisc/kernel/time.c
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arch/parisc/kernel/time.c
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#include <linux/rtc.h>
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#include <linux/platform_device.h>
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#include <asm/processor.h>
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#include <asm/pdcpat.h>
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static u64 cr16_clock_freq;
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static unsigned long clocktick;
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cd->event_handler = parisc_event_handler;
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clockevents_config_and_register(cd, cr16_clock_freq, min_delta, max_delta);
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}
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static void parisc_find_64bit_counter(void)
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{
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#ifdef CONFIG_64BIT
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uint64_t *pclock;
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unsigned long freq, unique;
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int ret;
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ret = pdc_pat_pd_get_platform_counter(&pclock, &freq, &unique);
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if (ret == PDC_OK)
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pr_info("64-bit counter found at %px, freq: %lu, unique: %lu\n",
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pclock, freq, unique);
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else
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pr_info("64-bit counter not found.\n");
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#endif
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}
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unsigned long notrace profile_pc(struct pt_regs *regs)
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sched_clock_register(read_cr16_sched_clock, BITS_PER_LONG, cr16_clock_freq);
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parisc_clockevent_init();
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/* check for free-running 64-bit platform counter */
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parisc_find_64bit_counter();
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/* register at clocksource framework */
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clocksource_register_hz(&clocksource_cr16, cr16_clock_freq);