2 * linux/arch/arm/plat-versatile/sched-clock.c
4 * Copyright (C) 1999 - 2003 ARM Limited
5 * Copyright (C) 2000 Deep Blue Solutions Ltd
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #include <linux/sched.h>
24 #include <asm/sched_clock.h>
25 #include <plat/sched_clock.h>
27 static DEFINE_CLOCK_DATA(cd
);
28 static void __iomem
*ctr
;
31 * Constants generated by clocks_calc_mult_shift(m, s, 24MHz, NSEC_PER_SEC, 60).
32 * This gives a resolution of about 41ns and a wrap period of about 178s.
34 #define SC_MULT 2796202667u
37 unsigned long long notrace
sched_clock(void)
41 return cyc_to_fixed_sched_clock(&cd
, cyc
, (u32
)~0,
47 static void notrace
versatile_update_sched_clock(void)
50 update_sched_clock(&cd
, cyc
, (u32
)~0);
53 void __init
versatile_sched_clock_init(void __iomem
*reg
, unsigned long rate
)
56 init_fixed_sched_clock(&cd
, versatile_update_sched_clock
,
57 32, rate
, SC_MULT
, SC_SHIFT
);