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> 9 static 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 */ 25 void 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 49 void 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 64 void 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 82 void 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 } 104 105 void 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