42 lines
791 B
C
42 lines
791 B
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Cobalt time initialization.
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*
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* Copyright (C) 2007 Yoichi Yuasa <yuasa@linux-mips.org>
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*/
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#include <linux/i8253.h>
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#include <linux/init.h>
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#include <asm/gt64120.h>
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#include <asm/time.h>
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#define GT641XX_BASE_CLOCK 50000000 /* 50MHz */
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void __init plat_time_init(void)
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{
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u32 start, end;
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int i = HZ / 10;
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setup_pit_timer();
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gt641xx_set_base_clock(GT641XX_BASE_CLOCK);
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/*
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* MIPS counter frequency is measured during a 100msec interval
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* using GT64111 timer0.
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*/
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while (!gt641xx_timer0_state())
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;
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start = read_c0_count();
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while (i--)
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while (!gt641xx_timer0_state())
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;
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end = read_c0_count();
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mips_hpt_frequency = (end - start) * 10;
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printk(KERN_INFO "MIPS counter frequency %dHz\n", mips_hpt_frequency);
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}
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