?? interrupts.c
字號:
/* * (C) Copyright 2004-2005, Greg Ungerer <greg.ungerer@opengear.com> * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */#include <common.h>#include <asm/arch/platform.h>/* * Handy KS8695 register access functions. */#define ks8695_read(a) *((volatile ulong *) (KS8695_IO_BASE + (a)))#define ks8695_write(a,v) *((volatile ulong *) (KS8695_IO_BASE + (a))) = (v)int timer_inited;ulong timer_ticks;int interrupt_init (void){ /* nothing happens here - we don't setup any IRQs */ return (0);}/* * Initial timer set constants. Nothing complicated, just set for a 1ms * tick. */#define TIMER_INTERVAL (TICKS_PER_uSEC * mSEC_1)#define TIMER_COUNT (TIMER_INTERVAL / 2)#define TIMER_PULSE TIMER_COUNTvoid reset_timer_masked(void){ /* Set the hadware timer for 1ms */ ks8695_write(KS8695_TIMER1, TIMER_COUNT); ks8695_write(KS8695_TIMER1_PCOUNT, TIMER_PULSE); ks8695_write(KS8695_TIMER_CTRL, 0x2); timer_ticks = 0; timer_inited++;}void reset_timer(void){ reset_timer_masked();}ulong get_timer_masked(void){ /* Check for timer wrap */ if (ks8695_read(KS8695_INT_STATUS) & KS8695_INTMASK_TIMERINT1) { /* Clear interrupt condition */ ks8695_write(KS8695_INT_STATUS, KS8695_INTMASK_TIMERINT1); timer_ticks++; } return timer_ticks;}ulong get_timer(ulong base){ return (get_timer_masked() - base);}void set_timer(ulong t){ timer_ticks = t;}void udelay(ulong usec){ ulong start = get_timer_masked(); ulong end; if (!timer_inited) reset_timer(); /* Only 1ms resolution :-( */ end = usec / 1000; while (get_timer(start) < end) ;}void reset_cpu (ulong ignored){ ulong tc; /* Set timer0 to watchdog, and let it timeout */ tc = ks8695_read(KS8695_TIMER_CTRL) & 0x2; ks8695_write(KS8695_TIMER_CTRL, tc); ks8695_write(KS8695_TIMER0, ((10 << 8) | 0xff)); ks8695_write(KS8695_TIMER_CTRL, (tc | 0x1)); /* Should only wait here till watchdog resets */ for (;;) ;}
?? 快捷鍵說明
復(fù)制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -