1*10465441SEvalZero /*
2*10465441SEvalZero * File : cpu.c
3*10465441SEvalZero * COPYRIGHT (C) 2008 - 2016, RT-Thread Development Team
4*10465441SEvalZero *
5*10465441SEvalZero * This program is free software; you can redistribute it and/or modify
6*10465441SEvalZero * it under the terms of the GNU General Public License as published by
7*10465441SEvalZero * the Free Software Foundation; either version 2 of the License, or
8*10465441SEvalZero * (at your option) any later version.
9*10465441SEvalZero *
10*10465441SEvalZero * This program is distributed in the hope that it will be useful,
11*10465441SEvalZero * but WITHOUT ANY WARRANTY; without even the implied warranty of
12*10465441SEvalZero * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13*10465441SEvalZero * GNU General Public License for more details.
14*10465441SEvalZero *
15*10465441SEvalZero * You should have received a copy of the GNU General Public License along
16*10465441SEvalZero * with this program; if not, write to the Free Software Foundation, Inc.,
17*10465441SEvalZero * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18*10465441SEvalZero *
19*10465441SEvalZero * Change Logs:
20*10465441SEvalZero * Date Author Notes
21*10465441SEvalZero * 2010-07-09 Bernard first version
22*10465441SEvalZero * 2010-09-11 Bernard add CPU reset implementation
23*10465441SEvalZero */
24*10465441SEvalZero #include <rtthread.h>
25*10465441SEvalZero #include <board.h>
26*10465441SEvalZero
27*10465441SEvalZero /**
28*10465441SEvalZero * @addtogroup Ingenic
29*10465441SEvalZero */
30*10465441SEvalZero /*@{*/
31*10465441SEvalZero
32*10465441SEvalZero /**
33*10465441SEvalZero * this function will reset CPU
34*10465441SEvalZero *
35*10465441SEvalZero */
rt_hw_cpu_reset()36*10465441SEvalZero void rt_hw_cpu_reset()
37*10465441SEvalZero {
38*10465441SEvalZero /* open the watch-dog */
39*10465441SEvalZero REG_WDT_TCSR = WDT_TCSR_EXT_EN;
40*10465441SEvalZero REG_WDT_TCSR |= WDT_TCSR_PRESCALE_1024;
41*10465441SEvalZero REG_WDT_TDR = 0x03;
42*10465441SEvalZero REG_WDT_TCNT = 0x00;
43*10465441SEvalZero REG_WDT_TCER |= WDT_TCER_TCEN;
44*10465441SEvalZero
45*10465441SEvalZero rt_kprintf("reboot system...\n");
46*10465441SEvalZero while (1);
47*10465441SEvalZero }
48*10465441SEvalZero
49*10465441SEvalZero /**
50*10465441SEvalZero * this function will shutdown CPU
51*10465441SEvalZero *
52*10465441SEvalZero */
rt_hw_cpu_shutdown()53*10465441SEvalZero void rt_hw_cpu_shutdown()
54*10465441SEvalZero {
55*10465441SEvalZero rt_kprintf("shutdown...\n");
56*10465441SEvalZero
57*10465441SEvalZero while (1);
58*10465441SEvalZero }
59*10465441SEvalZero
60*10465441SEvalZero /**
61*10465441SEvalZero * This function finds the first bit set (beginning with the least significant bit)
62*10465441SEvalZero * in value and return the index of that bit.
63*10465441SEvalZero *
64*10465441SEvalZero * Bits are numbered starting at 1 (the least significant bit). A return value of
65*10465441SEvalZero * zero from any of these functions means that the argument was zero.
66*10465441SEvalZero *
67*10465441SEvalZero * @return return the index of the first bit set. If value is 0, then this function
68*10465441SEvalZero * shall return 0.
69*10465441SEvalZero */
__rt_ffs(int value)70*10465441SEvalZero int __rt_ffs(int value)
71*10465441SEvalZero {
72*10465441SEvalZero return __builtin_ffs(value);
73*10465441SEvalZero }
74*10465441SEvalZero
75*10465441SEvalZero /*@}*/
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