55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
|
/*
|
||
|
|
* Cobalt time initialization.
|
||
|
|
*
|
||
|
|
* Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org>
|
||
|
|
*
|
||
|
|
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
#include <linux/i8253.h>
|
||
|
|
#include <linux/init.h>
|
||
|
|
|
||
|
|
#include <asm/gt64120.h>
|
||
|
|
#include <asm/time.h>
|
||
|
|
|
||
|
|
#define GT641XX_BASE_CLOCK 50000000 /* 50MHz */
|
||
|
|
|
||
|
|
void __init plat_time_init(void)
|
||
|
|
{
|
||
|
|
u32 start, end;
|
||
|
|
int i = HZ / 10;
|
||
|
|
|
||
|
|
setup_pit_timer();
|
||
|
|
|
||
|
|
gt641xx_set_base_clock(GT641XX_BASE_CLOCK);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* MIPS counter frequency is measured during a 100msec interval
|
||
|
|
* using GT64111 timer0.
|
||
|
|
*/
|
||
|
|
while (!gt641xx_timer0_state())
|
||
|
|
;
|
||
|
|
|
||
|
|
start = read_c0_count();
|
||
|
|
|
||
|
|
while (i--)
|
||
|
|
while (!gt641xx_timer0_state())
|
||
|
|
;
|
||
|
|
|
||
|
|
end = read_c0_count();
|
||
|
|
|
||
|
|
mips_hpt_frequency = (end - start) * 10;
|
||
|
|
printk(KERN_INFO "MIPS counter frequency %dHz\n", mips_hpt_frequency);
|
||
|
|
}
|