// 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); }