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arch
mips
cobalt
time.c
Go to the documentation of this file.
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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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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