114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
/*
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* Copyright 2011 Linaro Limited
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* Aneesh V <aneesh@ti.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/arch/sys_proto.h>
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static void do_cancel_out(u32 *num, u32 *den, u32 factor)
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{
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while (1) {
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if (((*num)/factor*factor == (*num)) &&
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((*den)/factor*factor == (*den))) {
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(*num) /= factor;
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(*den) /= factor;
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} else
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break;
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}
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}
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/*
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* Cancel out the denominator and numerator of a fraction
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* to get smaller numerator and denominator.
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*/
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void cancel_out(u32 *num, u32 *den, u32 den_limit)
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{
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do_cancel_out(num, den, 2);
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do_cancel_out(num, den, 3);
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do_cancel_out(num, den, 5);
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do_cancel_out(num, den, 7);
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do_cancel_out(num, den, 11);
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do_cancel_out(num, den, 13);
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do_cancel_out(num, den, 17);
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while ((*den) > den_limit) {
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*num /= 2;
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/*
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* Round up the denominator so that the final fraction
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* (num/den) is always <= the desired value
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*/
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*den = (*den + 1) / 2;
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}
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}
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__weak void omap_die_id(unsigned int *die_id)
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{
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die_id[0] = die_id[1] = die_id[2] = die_id[3] = 0;
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}
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void omap_die_id_serial(void)
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{
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unsigned int die_id[4] = { 0 };
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char serial_string[17] = { 0 };
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omap_die_id((unsigned int *)&die_id);
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if (!getenv("serial#")) {
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snprintf(serial_string, sizeof(serial_string),
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"%08x%08x", die_id[0], die_id[3]);
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setenv("serial#", serial_string);
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}
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}
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void omap_die_id_get_board_serial(struct tag_serialnr *serialnr)
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{
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char *serial_string;
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unsigned long long serial;
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serial_string = getenv("serial#");
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if (serial_string) {
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serial = simple_strtoull(serial_string, NULL, 16);
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serialnr->high = (unsigned int) (serial >> 32);
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serialnr->low = (unsigned int) (serial & 0xffffffff);
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} else {
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serialnr->high = 0;
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serialnr->low = 0;
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}
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}
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void omap_die_id_usbethaddr(void)
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{
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unsigned int die_id[4] = { 0 };
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unsigned char mac[6] = { 0 };
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omap_die_id((unsigned int *)&die_id);
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if (!getenv("usbethaddr")) {
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/*
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* Create a fake MAC address from the processor ID code.
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* First byte is 0x02 to signify locally administered.
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*/
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mac[0] = 0x02;
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mac[1] = die_id[3] & 0xff;
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mac[2] = die_id[2] & 0xff;
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mac[3] = die_id[1] & 0xff;
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mac[4] = die_id[0] & 0xff;
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mac[5] = (die_id[0] >> 8) & 0xff;
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eth_setenv_enetaddr("usbethaddr", mac);
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}
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}
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void omap_die_id_display(void)
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{
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unsigned int die_id[4] = { 0 };
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omap_die_id(die_id);
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printf("OMAP die ID: %08x%08x%08x%08x\n", die_id[0], die_id[1],
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die_id[2], die_id[3]);
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}
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