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317adb12e5
This is to make checkpatch.pl happy for the next patch. It would otherwise say -- ERROR: Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. The FSF has changed addresses in the past, and may do so again. Linux already includes a copy of the GPL. Acked-by: Maciej W. Rozycki <macro@linux-mips.org> Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> Cc: linux-mips@linux-mips.org Cc: macro@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9481/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
/*
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* DEC I/O ASIC's counter clocksource
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*
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* Copyright (C) 2008 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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#include <linux/clocksource.h>
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#include <linux/init.h>
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#include <asm/ds1287.h>
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#include <asm/time.h>
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#include <asm/dec/ioasic.h>
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#include <asm/dec/ioasic_addrs.h>
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static cycle_t dec_ioasic_hpt_read(struct clocksource *cs)
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{
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return ioasic_read(IO_REG_FCTR);
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}
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static struct clocksource clocksource_dec = {
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.name = "dec-ioasic",
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.read = dec_ioasic_hpt_read,
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.mask = CLOCKSOURCE_MASK(32),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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int __init dec_ioasic_clocksource_init(void)
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{
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unsigned int freq;
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u32 start, end;
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int i = HZ / 8;
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ds1287_timer_state();
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while (!ds1287_timer_state())
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;
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start = dec_ioasic_hpt_read(&clocksource_dec);
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while (i--)
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while (!ds1287_timer_state())
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;
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end = dec_ioasic_hpt_read(&clocksource_dec);
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freq = (end - start) * 8;
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/* An early revision of the I/O ASIC didn't have the counter. */
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if (!freq)
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return -ENXIO;
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printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq);
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clocksource_dec.rating = 200 + freq / 10000000;
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clocksource_register_hz(&clocksource_dec, freq);
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return 0;
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}
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