+++ /dev/null
-/* Some utility functions around the free running clock on ARM. The clock is
- * 32-bits wide, but we provide 64-bit wrapper functions to make it look
- * similar to the read_tsc functions. On hardware we could actually make use
- * of the timer overflow counter, but emulator doesn't emulate it. */
-
-#include "omap_timer_registers.h"
-#include <minix/minlib.h>
-#include <minix/sysutil.h>
-#include <minix/type.h>
-#include <sys/errno.h>
-#include <sys/types.h>
-
-
-static u64_t calib_hz = 1625000, Hz;
-#define MICROHZ 1000000ULL /* number of micros per second */
-#define MICROSPERTICK(h) (MICROHZ/(h)) /* number of micros per HZ tick */
-
-int
-micro_delay(u32_t micros)
-{
- u64_t start, delta, delta_end;
-
- Hz = sys_hz();
-
- /* Start of delay. */
- start = read_frclock_64();
- delta_end = (calib_hz * micros) / MICROHZ;
-
- /* If we have to wait for at least one HZ tick, use the regular
- * tickdelay first. Round downwards on purpose, so the average
- * half-tick we wait short (depending on where in the current tick
- * we call tickdelay). We can correct for both overhead of tickdelay
- * itself and the short wait in the busywait later.
- */
- if (micros >= MICROSPERTICK(Hz))
- tickdelay(micros*Hz/MICROHZ);
-
- /* Wait (the rest) of the delay time using busywait. */
- do {
- delta = read_frclock_64();
- } while (delta_frclock_64(start, delta) < delta_end);
-
-
- return 0;
-}
-
-u32_t frclock_64_to_micros(u64_t tsc)
-{
- return (u32_t) tsc / calib_hz;
-}
-
-u32_t
-read_frclock(void)
-{
- extern struct minix_kerninfo *_minix_kerninfo;
- volatile u32_t *frclock;
- frclock = (u32_t *)((u8_t *) _minix_kerninfo->minix_frclock+OMAP3_TCRR);
- return (u64_t) *frclock;
-}
-
-u32_t
-delta_frclock(u32_t base, u32_t cur)
-{
- u32_t delta;
-
- if (cur < base) {
- /* We have wrapped around, so delta is base to wrapping point
- * plus starting point (0) to cur. This supports wrapping once
- * only. */
- delta = (UINT_MAX - base) + cur;
- } else {
- delta = cur - base;
- }
-
- return delta;
-}
-
-u64_t
-read_frclock_64(void)
-{
- return (u64_t) read_frclock();
-}
-
-u64_t
-delta_frclock_64(u64_t base, u64_t cur)
-{
- return delta_frclock((u32_t) base, (u32_t) cur);
-}
-