// SPDX-License-Identifier: GPL-2.0-or-later | |
/* | |
* Cobalt time initialization. | |
* | |
* Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org> | |
*/ | |
#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); | |
} |