arch/arm/plat-versatile/sched-clock.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  linux/arch/arm/plat-versatile/sched-clock.c
   4  *
   5  *  Copyright (C) 1999 - 2003 ARM Limited
   6  *  Copyright (C) 2000 Deep Blue Solutions Ltd
   7  */
   8 #include <linux/kernel.h>
   9 #include <linux/io.h>
  10 #include <linux/sched_clock.h>
  11
  12 #include <plat/sched_clock.h>
  13
  14 static void __iomem *ctr;
  15
  16 static u64 notrace versatile_read_sched_clock(void)
  17 {
  18         if (ctr)
  19                 return readl(ctr);
  20
  21         return 0;
  22 }
  23
  24 void __init versatile_sched_clock_init(void __iomem *reg, unsigned long rate)
  25 {
  26         ctr = reg;
  27         sched_clock_register(versatile_read_sched_clock, 32, rate);
  28 }