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/*
* Copyright 2011 Linaro Limited
* Aneesh V <aneesh@ti.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/sys_proto.h>
static void do_cancel_out(u32 *num, u32 *den, u32 factor)
{
while (1) {
if (((*num)/factor*factor == (*num)) &&
((*den)/factor*factor == (*den))) {
(*num) /= factor;
(*den) /= factor;
} else
break;
}
}
/*
* Cancel out the denominator and numerator of a fraction
* to get smaller numerator and denominator.
*/
void cancel_out(u32 *num, u32 *den, u32 den_limit)
{
do_cancel_out(num, den, 2);
do_cancel_out(num, den, 3);
do_cancel_out(num, den, 5);
do_cancel_out(num, den, 7);
do_cancel_out(num, den, 11);
do_cancel_out(num, den, 13);
do_cancel_out(num, den, 17);
while ((*den) > den_limit) {
*num /= 2;
/*
* Round up the denominator so that the final fraction
* (num/den) is always <= the desired value
*/
*den = (*den + 1) / 2;
}
}
__weak void omap_die_id(unsigned int *die_id)
{
die_id[0] = die_id[1] = die_id[2] = die_id[3] = 0;
}
void omap_die_id_serial(void)
{
unsigned int die_id[4] = { 0 };
char serial_string[17] = { 0 };
omap_die_id((unsigned int *)&die_id);
if (!getenv("serial#")) {
snprintf(serial_string, sizeof(serial_string),
"%08x%08x", die_id[0], die_id[3]);
setenv("serial#", serial_string);
}
}
void omap_die_id_usbethaddr(void)
{
unsigned int die_id[4] = { 0 };
unsigned char mac[6] = { 0 };
omap_die_id((unsigned int *)&die_id);
if (!getenv("usbethaddr")) {
/*
* Create a fake MAC address from the processor ID code.
* First byte is 0x02 to signify locally administered.
*/
mac[0] = 0x02;
mac[1] = die_id[3] & 0xff;
mac[2] = die_id[2] & 0xff;
mac[3] = die_id[1] & 0xff;
mac[4] = die_id[0] & 0xff;
mac[5] = (die_id[0] >> 8) & 0xff;
eth_setenv_enetaddr("usbethaddr", mac);
}
}
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