LXR uboot/arch/arm/cpu/armv7/omap-common/utils.c

   1/*
   2 * Copyright 2011 Linaro Limited
   3 * Aneesh V <aneesh@ti.com>
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7#include <common.h>
   8#include <asm/arch/sys_proto.h>
   9static void do_cancel_out(u32 *num, u32 *den, u32 factor)
  10{
  11        while (1) {
  12                if (((*num)/factor*factor == (*num)) &&
  13                   ((*den)/factor*factor == (*den))) {
  14                        (*num) /= factor;
  15                        (*den) /= factor;
  16                } else
  17                        break;
  18        }
  19}
  20
  21/*
  22 * Cancel out the denominator and numerator of a fraction
  23 * to get smaller numerator and denominator.
  24 */
  25void cancel_out(u32 *num, u32 *den, u32 den_limit)
  26{
  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) {
  35                *num /= 2;
  36                /*
  37                 * Round up the denominator so that the final fraction
  38                 * (num/den) is always <= the desired value
  39                 */
  40                *den = (*den + 1) / 2;
  41        }
  42}
  43
  44__weak void omap_die_id(unsigned int *die_id)
  45{
  46        die_id[0] = die_id[1] = die_id[2] = die_id[3] = 0;
  47}
  48
  49void omap_die_id_serial(void)
  50{
  51        unsigned int die_id[4] = { 0 };
  52        char serial_string[17] = { 0 };
  53
  54        omap_die_id((unsigned int *)&die_id);
  55
  56        if (!getenv("serial#")) {
  57                snprintf(serial_string, sizeof(serial_string),
  58                        "%08x%08x", die_id[0], die_id[3]);
  59
  60                setenv("serial#", serial_string);
  61        }
  62}
  63
  64void omap_die_id_get_board_serial(struct tag_serialnr *serialnr)
  65{
  66        char *serial_string;
  67        unsigned long long serial;
  68
  69        serial_string = getenv("serial#");
  70
  71        if (serial_string) {
  72                serial = simple_strtoull(serial_string, NULL, 16);
  73
  74                serialnr->high = (unsigned int) (serial >> 32);
  75                serialnr->low = (unsigned int) (serial & 0xffffffff);
  76        } else {
  77                serialnr->high = 0;
  78                serialnr->low = 0;
  79        }
  80}
  81
  82void omap_die_id_usbethaddr(void)
  83{
  84        unsigned int die_id[4] = { 0 };
  85        unsigned char mac[6] = { 0 };
  86
  87        omap_die_id((unsigned int *)&die_id);
  88
  89        if (!getenv("usbethaddr")) {
  90                /*
  91                 * Create a fake MAC address from the processor ID code.
  92                 * First byte is 0x02 to signify locally administered.
  93                 */
  94                mac[0] = 0x02;
  95                mac[1] = die_id[3] & 0xff;
  96                mac[2] = die_id[2] & 0xff;
  97                mac[3] = die_id[1] & 0xff;
  98                mac[4] = die_id[0] & 0xff;
  99                mac[5] = (die_id[0] >> 8) & 0xff;
 100
 101                eth_setenv_enetaddr("usbethaddr", mac);
 102        }
 103}
 104
 105void omap_die_id_display(void)
 106{
 107        unsigned int die_id[4] = { 0 };
 108
 109        omap_die_id(die_id);
 110
 111        printf("OMAP die ID: %08x%08x%08x%08x\n", die_id[3], die_id[2],
 112                die_id[1], die_id[0]);
 113}
 114