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[MIPS] add DECstation I/O ASIC clocksource
Add DECstation I/O ASIC clocksource Signed-off-by: Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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Yoichi Yuasa
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Ralf Baechle
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Apr 28, 2008
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/* | ||
* DEC I/O ASIC's counter clocksource | ||
* | ||
* Copyright (C) 2008 Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp> | ||
* | ||
* 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/clocksource.h> | ||
#include <linux/init.h> | ||
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#include <asm/ds1287.h> | ||
#include <asm/time.h> | ||
#include <asm/dec/ioasic.h> | ||
#include <asm/dec/ioasic_addrs.h> | ||
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static cycle_t dec_ioasic_hpt_read(void) | ||
{ | ||
return ioasic_read(IO_REG_FCTR); | ||
} | ||
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static struct clocksource clocksource_dec = { | ||
.name = "dec-ioasic", | ||
.read = dec_ioasic_hpt_read, | ||
.mask = CLOCKSOURCE_MASK(32), | ||
.flags = CLOCK_SOURCE_IS_CONTINUOUS, | ||
}; | ||
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void __init dec_ioasic_clocksource_init(void) | ||
{ | ||
unsigned int freq; | ||
u32 start, end; | ||
int i = HZ / 10; | ||
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while (!ds1287_timer_state()) | ||
; | ||
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start = dec_ioasic_hpt_read(); | ||
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while (i--) | ||
while (!ds1287_timer_state()) | ||
; | ||
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end = dec_ioasic_hpt_read(); | ||
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freq = (end - start) * 10; | ||
printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq); | ||
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clocksource_dec.rating = 200 + freq / 10000000; | ||
clocksource_set_clock(&clocksource_dec, freq); | ||
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clocksource_register(&clocksource_dec); | ||
} |
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