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/setup.h> 9 #include <asm/arch/sys_proto.h> 10 static void do_cancel_out(u32 *num, u32 *den, u32 factor) 11 { 12 while (1) { 13 if (((*num)/factor*factor == (*num)) && 14 ((*den)/factor*factor == (*den))) { 15 (*num) /= factor; 16 (*den) /= factor; 17 } else 18 break; 19 } 20 } 21 22 /* 23 * Cancel out the denominator and numerator of a fraction 24 * to get smaller numerator and denominator. 25 */ 26 void cancel_out(u32 *num, u32 *den, u32 den_limit) 27 { 28 do_cancel_out(num, den, 2); 29 do_cancel_out(num, den, 3); 30 do_cancel_out(num, den, 5); 31 do_cancel_out(num, den, 7); 32 do_cancel_out(num, den, 11); 33 do_cancel_out(num, den, 13); 34 do_cancel_out(num, den, 17); 35 while ((*den) > den_limit) { 36 *num /= 2; 37 /* 38 * Round up the denominator so that the final fraction 39 * (num/den) is always <= the desired value 40 */ 41 *den = (*den + 1) / 2; 42 } 43 } 44 45 __weak void omap_die_id(unsigned int *die_id) 46 { 47 die_id[0] = die_id[1] = die_id[2] = die_id[3] = 0; 48 } 49 50 void omap_die_id_serial(void) 51 { 52 unsigned int die_id[4] = { 0 }; 53 char serial_string[17] = { 0 }; 54 55 omap_die_id((unsigned int *)&die_id); 56 57 if (!getenv("serial#")) { 58 snprintf(serial_string, sizeof(serial_string), 59 "%08x%08x", die_id[0], die_id[3]); 60 61 setenv("serial#", serial_string); 62 } 63 } 64 65 void omap_die_id_get_board_serial(struct tag_serialnr *serialnr) 66 { 67 char *serial_string; 68 unsigned long long serial; 69 70 serial_string = getenv("serial#"); 71 72 if (serial_string) { 73 serial = simple_strtoull(serial_string, NULL, 16); 74 75 serialnr->high = (unsigned int) (serial >> 32); 76 serialnr->low = (unsigned int) (serial & 0xffffffff); 77 } else { 78 serialnr->high = 0; 79 serialnr->low = 0; 80 } 81 } 82 83 void omap_die_id_usbethaddr(void) 84 { 85 unsigned int die_id[4] = { 0 }; 86 unsigned char mac[6] = { 0 }; 87 88 omap_die_id((unsigned int *)&die_id); 89 90 if (!getenv("usbethaddr")) { 91 /* 92 * Create a fake MAC address from the processor ID code. 93 * First byte is 0x02 to signify locally administered. 94 */ 95 mac[0] = 0x02; 96 mac[1] = die_id[3] & 0xff; 97 mac[2] = die_id[2] & 0xff; 98 mac[3] = die_id[1] & 0xff; 99 mac[4] = die_id[0] & 0xff; 100 mac[5] = (die_id[0] >> 8) & 0xff; 101 102 eth_setenv_enetaddr("usbethaddr", mac); 103 } 104 } 105 106 void omap_die_id_display(void) 107 { 108 unsigned int die_id[4] = { 0 }; 109 110 omap_die_id(die_id); 111 112 printf("OMAP die ID: %08x%08x%08x%08x\n", die_id[3], die_id[2], 113 die_id[1], die_id[0]); 114 } 115