max80_fw/fw/io.h

#ifndef IO_H
#define IO_H

#include "iodev.h"

static inline void pause(void)
{
    /* Placeholder for anything that might want to be done while waiting */
}

static inline void set_led(uint8_t leds)
{
    LED = leds;
}

static inline uint32_t rdtime(void)
{
    uint32_t t;

    asm volatile("rdtime %0" : "=r" (t));
    return t;
}

static inline uint64_t rdtimeq(void)
{
    uint32_t l, h1, h0;

    asm volatile("rdtimeh %0; rdtime %1; %rdtimeh %2"
		 : "=r" (h1), "=r" (l), "=r" (h0));

    return ((int32_t)l < 0) ? h1 : h0;
}

static inline void udelay(uint32_t us)
{
    uint32_t cycles = us * (CPU_HZ / 1000000);
    uint32_t start = rdtime();

    while (rdtime() - start < cycles)
	pause();
}

#endif /* IO_H */