u-boot/arch/arm/cpu/armv7/omap-common/utils.c
Dileep Katta f12467d1a5 ARM: DRA7: Set serial number environment variable
This patch populates serial number environment variable from
die_id_0 and die_id_1 register values for DRA7xx boards.

The function is added in omap common code so that this can be re-used.

Serial# environment variable will be useful to show correct
information in "fastboot devices" commands.

Ref:
http://git.omapzoom.org/?p=repo/u-boot.git;a=commit;h=a6bcaaf67f6e4bcd97808f53d0ceb4b0c04d583c

Signed-off-by: Angela Stegmaier <angelabaker@ti.com>
Signed-off-by: Dileep Katta <dileep.katta@linaro.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
2015-04-23 13:59:19 -04:00

75 lines
1.7 KiB
C

/*
* 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;
}
}
void __weak usb_fake_mac_from_die_id(u32 *id)
{
uint8_t device_mac[6];
if (!getenv("usbethaddr")) {
/*
* create a fake MAC address from the processor ID code.
* first byte is 0x02 to signify locally administered.
*/
device_mac[0] = 0x02;
device_mac[1] = id[3] & 0xff;
device_mac[2] = id[2] & 0xff;
device_mac[3] = id[1] & 0xff;
device_mac[4] = id[0] & 0xff;
device_mac[5] = (id[0] >> 8) & 0xff;
eth_setenv_enetaddr("usbethaddr", device_mac);
}
}
void __weak usb_set_serial_num_from_die_id(u32 *id)
{
char serialno[72];
uint32_t serialno_lo, serialno_hi;
if (!getenv("serial#")) {
serialno_hi = id[0];
serialno_lo = id[1];
sprintf(serialno, "%08x%08x", serialno_hi, serialno_lo);
setenv("serial#", serialno);
}
}