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Linux/arch/mips/kernel/csrc-ioasic.c

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  1 /*
  2  *  DEC I/O ASIC's counter clocksource
  3  *
  4  *  Copyright (C) 2008  Yoichi Yuasa <yuasa@linux-mips.org>
  5  *
  6  *  This program is free software; you can redistribute it and/or modify
  7  *  it under the terms of the GNU General Public License as published by
  8  *  the Free Software Foundation; either version 2 of the License, or
  9  *  (at your option) any later version.
 10  *
 11  *  This program is distributed in the hope that it will be useful,
 12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *  GNU General Public License for more details.
 15  */
 16 #include <linux/clocksource.h>
 17 #include <linux/sched_clock.h>
 18 #include <linux/init.h>
 19 
 20 #include <asm/ds1287.h>
 21 #include <asm/time.h>
 22 #include <asm/dec/ioasic.h>
 23 #include <asm/dec/ioasic_addrs.h>
 24 
 25 static u64 dec_ioasic_hpt_read(struct clocksource *cs)
 26 {
 27         return ioasic_read(IO_REG_FCTR);
 28 }
 29 
 30 static struct clocksource clocksource_dec = {
 31         .name           = "dec-ioasic",
 32         .read           = dec_ioasic_hpt_read,
 33         .mask           = CLOCKSOURCE_MASK(32),
 34         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 35 };
 36 
 37 static u64 notrace dec_ioasic_read_sched_clock(void)
 38 {
 39         return ioasic_read(IO_REG_FCTR);
 40 }
 41 
 42 int __init dec_ioasic_clocksource_init(void)
 43 {
 44         unsigned int freq;
 45         u32 start, end;
 46         int i = HZ / 8;
 47 
 48         ds1287_timer_state();
 49         while (!ds1287_timer_state())
 50                 ;
 51 
 52         start = dec_ioasic_hpt_read(&clocksource_dec);
 53 
 54         while (i--)
 55                 while (!ds1287_timer_state())
 56                         ;
 57 
 58         end = dec_ioasic_hpt_read(&clocksource_dec);
 59 
 60         freq = (end - start) * 8;
 61 
 62         /* An early revision of the I/O ASIC didn't have the counter.  */
 63         if (!freq)
 64                 return -ENXIO;
 65 
 66         printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq);
 67 
 68         clocksource_dec.rating = 200 + freq / 10000000;
 69         clocksource_register_hz(&clocksource_dec, freq);
 70 
 71         sched_clock_register(dec_ioasic_read_sched_clock, 32, freq);
 72 
 73         return 0;
 74 }
 75 

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