~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/mips/kernel/csrc-ioasic.c

Version: ~ [ linux-5.15-rc3 ] ~ [ linux-5.14.8 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.69 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.149 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.208 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.248 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.284 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.285 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *  DEC I/O ASIC's counter clocksource
  4  *
  5  *  Copyright (C) 2008  Yoichi Yuasa <yuasa@linux-mips.org>
  6  */
  7 #include <linux/clocksource.h>
  8 #include <linux/sched_clock.h>
  9 #include <linux/init.h>
 10 
 11 #include <asm/ds1287.h>
 12 #include <asm/time.h>
 13 #include <asm/dec/ioasic.h>
 14 #include <asm/dec/ioasic_addrs.h>
 15 
 16 static u64 dec_ioasic_hpt_read(struct clocksource *cs)
 17 {
 18         return ioasic_read(IO_REG_FCTR);
 19 }
 20 
 21 static struct clocksource clocksource_dec = {
 22         .name           = "dec-ioasic",
 23         .read           = dec_ioasic_hpt_read,
 24         .mask           = CLOCKSOURCE_MASK(32),
 25         .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 26 };
 27 
 28 static u64 notrace dec_ioasic_read_sched_clock(void)
 29 {
 30         return ioasic_read(IO_REG_FCTR);
 31 }
 32 
 33 int __init dec_ioasic_clocksource_init(void)
 34 {
 35         unsigned int freq;
 36         u32 start, end;
 37         int i = HZ / 8;
 38 
 39         ds1287_timer_state();
 40         while (!ds1287_timer_state())
 41                 ;
 42 
 43         start = dec_ioasic_hpt_read(&clocksource_dec);
 44 
 45         while (i--)
 46                 while (!ds1287_timer_state())
 47                         ;
 48 
 49         end = dec_ioasic_hpt_read(&clocksource_dec);
 50 
 51         freq = (end - start) * 8;
 52 
 53         /* An early revision of the I/O ASIC didn't have the counter.  */
 54         if (!freq)
 55                 return -ENXIO;
 56 
 57         printk(KERN_INFO "I/O ASIC clock frequency %dHz\n", freq);
 58 
 59         clocksource_dec.rating = 200 + freq / 10000000;
 60         clocksource_register_hz(&clocksource_dec, freq);
 61 
 62         sched_clock_register(dec_ioasic_read_sched_clock, 32, freq);
 63 
 64         return 0;
 65 }
 66 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp