20 #include <asm/hpet.h>
357 static u64 tsc_read_refs(u64 *p, int hpet)  in tsc_read_refs()  argument
365 		if (hpet)  in tsc_read_refs()
377  * Calculate the TSC frequency from HPET reference
754  * calibrate cpu using pit, hpet, and ptimer methods. They are available
762 	int hpet = is_hpet_enabled(), i, loopmin;  in pit_hpet_ptimer_calibrate_cpu()  local
780 	 * 2) Reference counter. If available we use the HPET or the  in pit_hpet_ptimer_calibrate_cpu()
799 		 * hpet/pmtimer when available. Then do the PIT  in pit_hpet_ptimer_calibrate_cpu()
804 		tsc1 = tsc_read_refs(&ref1, hpet);  in pit_hpet_ptimer_calibrate_cpu()
806 		tsc2 = tsc_read_refs(&ref2, hpet);  in pit_hpet_ptimer_calibrate_cpu()
812 		/* hpet or pmtimer available ? */  in pit_hpet_ptimer_calibrate_cpu()
821 		if (hpet)  in pit_hpet_ptimer_calibrate_cpu()
840 				hpet ? "HPET" : "PMTIMER", i + 1);  in pit_hpet_ptimer_calibrate_cpu()
848 		 * the HPET/PMTIMER to make the result precise.  in pit_hpet_ptimer_calibrate_cpu()
865 		if (!hpet && !ref1 && !ref2) {  in pit_hpet_ptimer_calibrate_cpu()
866 			pr_notice("No reference (HPET/PMTIMER) available\n");  in pit_hpet_ptimer_calibrate_cpu()
872 			pr_warn("HPET/PMTIMER calibration failed\n");  in pit_hpet_ptimer_calibrate_cpu()
878 			hpet ? "HPET" : "PMTIMER");  in pit_hpet_ptimer_calibrate_cpu()
884 	if (!hpet && !ref1 && !ref2) {  in pit_hpet_ptimer_calibrate_cpu()
891 		pr_warn("HPET/PMTIMER calibration failed. Using PIT calibration.\n");  in pit_hpet_ptimer_calibrate_cpu()
901 		hpet ? "HPET" : "PMTIMER", tsc_pit_min, tsc_ref_min);  in pit_hpet_ptimer_calibrate_cpu()
1318 	static int hpet;  in tsc_refine_calibration_work()  local
1335 		 * Only set hpet once, to avoid mixing hardware  in tsc_refine_calibration_work()
1336 		 * if the hpet becomes enabled later.  in tsc_refine_calibration_work()
1338 		hpet = is_hpet_enabled();  in tsc_refine_calibration_work()
1339 		tsc_start = tsc_read_refs(&ref_start, hpet);  in tsc_refine_calibration_work()
1344 	tsc_stop = tsc_read_refs(&ref_stop, hpet);  in tsc_refine_calibration_work()
1346 	/* hpet or pmtimer available ? */  in tsc_refine_calibration_work()
1356 	if (hpet)  in tsc_refine_calibration_work()
1373 			hpet ? "HPET" : "PM_TIMER",  in tsc_refine_calibration_work()
1443  * We use device_initcall here, to ensure we run after the hpet