diff options
Diffstat (limited to 'cpu/i386/timer.c')
| -rw-r--r-- | cpu/i386/timer.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/cpu/i386/timer.c b/cpu/i386/timer.c deleted file mode 100644 index 46db23f..0000000 --- a/cpu/i386/timer.c +++ /dev/null @@ -1,211 +0,0 @@ -/* - * (C) Copyright 2002 - * Daniel Engström, Omicron Ceti AB, daniel@omicron.se. - * - * 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/io.h> -#include <asm/i8254.h> -#include <asm/ibmpc.h> - - -static volatile unsigned long system_ticks; -static int timer_init_done =0; - -static void timer_isr(void *unused) -{ - system_ticks++; -} - -unsigned long get_system_ticks(void) -{ - return system_ticks; -} - -#define TIMER0_VALUE 0x04aa /* 1kHz 1.9318MHz / 1000 */ -#define TIMER2_VALUE 0x0a8e /* 440Hz */ - -int timer_init(void) -{ - system_ticks = 0; - - irq_install_handler(0, timer_isr, NULL); - - /* initialize timer 0 and 2 - * - * Timer 0 is used to increment system_tick 1000 times/sec - * Timer 1 was used for DRAM refresh in early PC's - * Timer 2 is used to drive the speaker - * (to stasrt a beep: write 3 to port 0x61, - * to stop it again: write 0) - */ - - outb(PIT_CMD_CTR0|PIT_CMD_BOTH|PIT_CMD_MODE2, PIT_BASE + PIT_COMMAND); - outb(TIMER0_VALUE&0xff, PIT_BASE + PIT_T0); - outb(TIMER0_VALUE>>8, PIT_BASE + PIT_T0); - - outb(PIT_CMD_CTR2|PIT_CMD_BOTH|PIT_CMD_MODE3, PIT_BASE + PIT_COMMAND); - outb(TIMER2_VALUE&0xff, PIT_BASE + PIT_T2); - outb(TIMER2_VALUE>>8, PIT_BASE + PIT_T2); - - timer_init_done = 1; - - return 0; -} - - -#ifdef CONFIG_SYS_TIMER_GENERIC - -/* the unit for these is CONFIG_SYS_HZ */ - -/* FixMe: implement these */ -void reset_timer (void) -{ - system_ticks = 0; -} - -ulong get_timer (ulong base) -{ - return (system_ticks - base); -} - -void set_timer (ulong t) -{ - system_ticks = t; -} - -static u16 read_pit(void) -{ - u8 low; - outb(PIT_CMD_LATCH, PIT_BASE + PIT_COMMAND); - low = inb(PIT_BASE + PIT_T0); - return ((inb(PIT_BASE + PIT_T0) << 8) | low); -} - -/* this is not very exact */ -void udelay (unsigned long usec) -{ - int counter; - int wraps; - - if (!timer_init_done) { - return; - } - counter = read_pit(); - wraps = usec/1000; - usec = usec%1000; - - usec*=1194; - usec/=1000; - usec+=counter; - if (usec > 1194) { - usec-=1194; - wraps++; - } - - while (1) { - int new_count = read_pit(); - - if (((new_count < usec) && !wraps) || wraps < 0) { - break; - } - - if (new_count > counter) { - wraps--; - } - counter = new_count; - } - -} - -#if 0 -/* this is a version with debug output */ -void _udelay (unsigned long usec) -{ - int counter; - int wraps; - - int usec1, usec2, usec3; - int wraps1, wraps2, wraps3, wraps4; - int ctr1, ctr2, ctr3, nct1, nct2; - int i; - usec1=usec; - if (!timer_init_done) { - return; - } - counter = read_pit(); - ctr1 = counter; - wraps = usec/1000; - usec = usec%1000; - - usec2 = usec; - wraps1 = wraps; - - usec*=1194; - usec/=1000; - usec+=counter; - if (usec > 1194) { - usec-=1194; - wraps++; - } - - usec3 = usec; - wraps2 = wraps; - - ctr2 = wraps3 = nct1 = 4711; - ctr3 = wraps4 = nct2 = 4711; - i=0; - while (1) { - int new_count = read_pit(); - i++; - if ((new_count < usec && !wraps) || wraps < 0) { - break; - } - - if (new_count > counter) { - wraps--; - } - if (ctr2==4711) { - ctr2 = counter; - wraps3 = wraps; - nct1 = new_count; - } else { - ctr3 = counter; - wraps4 = wraps; - nct2 = new_count; - } - - counter = new_count; - } - - printf("udelay(%d)\n", usec1); - printf("counter %d\n", ctr1); - printf("1: wraps %d, usec %d\n", wraps1, usec2); - printf("2: wraps %d, usec %d\n", wraps2, usec3); - printf("new_count[0] %d counter %d wraps %d\n", nct1, ctr2, wraps3); - printf("new_count[%d] %d counter %d wraps %d\n", i, nct2, ctr3, wraps4); - - printf("%d %d %d %d %d\n", - read_pit(), read_pit(), read_pit(), - read_pit(), read_pit()); -} -#endif -#endif |