1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* This file is part of the coreboot project.
*
* Copyright (C) 2009 coresystems GmbH
*
* 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; version 2 of the License.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <arch/io.h>
#include <pc80/i8254.h>
#include <console/console.h>
/* Initialize i8254 timers */
void setup_i8254(void)
{
/* Timer 0 (taken from biosemu) */
outb(TIMER0_SEL|WORD_ACCESS|MODE3|BINARY_COUNT, TIMER_MODE_PORT);
outb(0x00, TIMER0_PORT);
outb(0x00, TIMER0_PORT);
/* Timer 1 */
outb(TIMER1_SEL|LOBYTE_ACCESS|MODE3|BINARY_COUNT, TIMER_MODE_PORT);
outb(0x12, TIMER1_PORT);
}
#if defined(CONFIG_UDELAY_TIMER2) && CONFIG_UDELAY_TIMER2
static void load_timer2(unsigned int ticks)
{
/* Set up the timer gate, turn off the speaker */
outb((inb(PPC_PORTB) & ~PPCB_SPKR) | PPCB_T2GATE, PPC_PORTB);
outb(TIMER2_SEL|WORD_ACCESS|MODE0|BINARY_COUNT, TIMER_MODE_PORT);
outb(ticks & 0xFF, TIMER2_PORT);
outb(ticks >> 8, TIMER2_PORT);
}
void udelay(int usecs)
{
load_timer2((usecs*TICKS_PER_MS)/1000);
while ((inb(PPC_PORTB) & PPCB_T2OUT) == 0)
;
}
#endif
|
