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/* SPDX-License-Identifier: GPL-2.0-only */
#include <arch/hpet.h>
#include <southbridge/intel/common/rcba.h>
#include <stdint.h>
#include "hpet.h"
#define HPTC 0x3404
#define HPET32(x) (*((volatile u32 *)(HPET_BASE_ADDRESS + (x))))
void enable_hpet(void)
{
u32 reg32;
reg32 = RCBA32(HPTC);
reg32 &= ~0x03;
reg32 |= (1 << 7);
RCBA32(HPTC) = reg32;
/* Read back for posted write to take effect */
RCBA32(HPTC);
HPET32(0x10) = HPET32(0x10) | 1;
}
void hpet_udelay(u32 delay)
{
u32 start, finish, now;
delay *= 15; /* now in usec */
start = HPET32(0xf0);
finish = start + delay;
while (1) {
now = HPET32(0xf0);
if (finish > start) {
if (now >= finish)
break;
} else {
if ((now < start) && (now >= finish))
break;
}
}
}
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