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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  *  You should have received a copy of the GNU General Public License
 17  *  along with this program; if not, write to the Free Software
 18  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 19  */
 20 #include <linux/clocksource.h>
 21 #include <linux/init.h>
 22 
 23 #include <asm/ds1287.h>
 24 #include <asm/time.h>
 25 #include <asm/dec/ioasic.h>
 26 #include <asm/dec/ioasic_addrs.h>
 27 
 28 static cycle_t dec_ioasic_hpt_read(struct clocksource *cs)
 29 {
 30         return ioasic_read(IO_REG_FCTR);
 31 }
 32 
 33 static struct clocksource clocksource_dec = {
 34         .name           = "dec-ioasic",
 35         .read           = dec_ioasic_hpt_read,
 36         .mask           = CLOCKSOURCE_MASK(32),
 37         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 38 };
 39 
 40 int __init dec_ioasic_clocksource_init(void)
 41 {
 42         unsigned int freq;
 43         u32 start, end;
 44         int i = HZ / 8;
 45 
 46         ds1287_timer_state();
 47         while (!ds1287_timer_state())
 48                 ;
 49 
 50         start = dec_ioasic_hpt_read(&clocksource_dec);
 51 
 52         while (i--)
 53                 while (!ds1287_timer_state())
 54                         ;
 55 
 56         end = dec_ioasic_hpt_read(&clocksource_dec);
 57 
 58         freq = (end - start) * 8;
 59 
 60         /* An early revision of the I/O ASIC didn't have the counter.  */
 61         if (!freq)
 62                 return -ENXIO;
 63 
 64         printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq);
 65 
 66         clocksource_dec.rating = 200 + freq / 10000000;
 67         clocksource_register_hz(&clocksource_dec, freq);
 68         return 0;
 69 }
 70 

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