1 /* 2 * File : cpu.c 3 * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License along 16 * with this program; if not, write to the Free Software Foundation, Inc., 17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Change Logs: 20 * Date Author Notes 21 * 2010-07-09 Bernard first version 22 * 2010-09-11 Bernard add CPU reset implementation 23 */ 24 #include <rtthread.h> 25 #include <board.h> 26 27 /** 28 * @addtogroup Ingenic 29 */ 30 /*@{*/ 31 32 /** 33 * this function will reset CPU 34 * 35 */ 36 void rt_hw_cpu_reset() 37 { 38 /* open the watch-dog */ 39 REG_WDT_TCSR = WDT_TCSR_EXT_EN; 40 REG_WDT_TCSR |= WDT_TCSR_PRESCALE_1024; 41 REG_WDT_TDR = 0x03; 42 REG_WDT_TCNT = 0x00; 43 REG_WDT_TCER |= WDT_TCER_TCEN; 44 45 rt_kprintf("reboot system...\n"); 46 while (1); 47 } 48 49 /** 50 * this function will shutdown CPU 51 * 52 */ 53 void rt_hw_cpu_shutdown() 54 { 55 rt_kprintf("shutdown...\n"); 56 57 while (1); 58 } 59 60 /** 61 * This function finds the first bit set (beginning with the least significant bit) 62 * in value and return the index of that bit. 63 * 64 * Bits are numbered starting at 1 (the least significant bit). A return value of 65 * zero from any of these functions means that the argument was zero. 66 * 67 * @return return the index of the first bit set. If value is 0, then this function 68 * shall return 0. 69 */ 70 int __rt_ffs(int value) 71 { 72 return __builtin_ffs(value); 73 } 74 75 /*@}*/ 76