2 * Copyright 2011 Linaro Limited
3 * Aneesh V <aneesh@ti.com>
5 * SPDX-License-Identifier: GPL-2.0+
8 #include <asm/arch/sys_proto.h>
9 static void do_cancel_out(u32 *num, u32 *den, u32 factor)
12 if (((*num)/factor*factor == (*num)) &&
13 ((*den)/factor*factor == (*den))) {
22 * Cancel out the denominator and numerator of a fraction
23 * to get smaller numerator and denominator.
25 void cancel_out(u32 *num, u32 *den, u32 den_limit)
27 do_cancel_out(num, den, 2);
28 do_cancel_out(num, den, 3);
29 do_cancel_out(num, den, 5);
30 do_cancel_out(num, den, 7);
31 do_cancel_out(num, den, 11);
32 do_cancel_out(num, den, 13);
33 do_cancel_out(num, den, 17);
34 while ((*den) > den_limit) {
37 * Round up the denominator so that the final fraction
38 * (num/den) is always <= the desired value
40 *den = (*den + 1) / 2;
44 void __weak usb_fake_mac_from_die_id(u32 *id)
46 uint8_t device_mac[6];
48 if (!getenv("usbethaddr")) {
50 * create a fake MAC address from the processor ID code.
51 * first byte is 0x02 to signify locally administered.
54 device_mac[1] = id[3] & 0xff;
55 device_mac[2] = id[2] & 0xff;
56 device_mac[3] = id[1] & 0xff;
57 device_mac[4] = id[0] & 0xff;
58 device_mac[5] = (id[0] >> 8) & 0xff;
60 eth_setenv_enetaddr("usbethaddr", device_mac);