max80_fw/fw/io.h

#ifndef IO_H
#define IO_H

#include "iodev.h"

static inline void con_write(uint8_t c)
{
    CONSOLE = c;
}

static inline void con_set_baudrate(uint32_t b)
{
    uint32_t bauddiv = (CON_BAUD_BASE + (b >> 1))/b;
    CON_BAUDDIV = bauddiv ? bauddiv - 1 : 0;
}

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_CLK_HZ / 1000000);
    uint32_t start = rdtime();

    while (rdtime() - start < cycles)
	/* wait */;
}

#endif /* IO_H */