LXR linux/arch/mips/pistachio/time.c

   1/*
   2 * Pistachio clocksource/timer setup
   3 *
   4 * Copyright (C) 2014 Google, Inc.
   5 *
   6 * This program is free software; you can redistribute it and/or modify it
   7 * under the terms and conditions of the GNU General Public License,
   8 * version 2, as published by the Free Software Foundation.
   9 */
  10
  11#include <linux/clk.h>
  12#include <linux/clk-provider.h>
  13#include <linux/clocksource.h>
  14#include <linux/init.h>
  15#include <linux/irqchip/mips-gic.h>
  16#include <linux/of.h>
  17
  18#include <asm/time.h>
  19
  20unsigned int get_c0_compare_int(void)
  21{
  22        return gic_get_c0_compare_int();
  23}
  24
  25int get_c0_perfcount_int(void)
  26{
  27        return gic_get_c0_perfcount_int();
  28}
  29EXPORT_SYMBOL_GPL(get_c0_perfcount_int);
  30
  31int get_c0_fdc_int(void)
  32{
  33        return gic_get_c0_fdc_int();
  34}
  35
  36void __init plat_time_init(void)
  37{
  38        struct device_node *np;
  39        struct clk *clk;
  40
  41        of_clk_init(NULL);
  42        clocksource_probe();
  43
  44        np = of_get_cpu_node(0, NULL);
  45        if (!np) {
  46                pr_err("Failed to get CPU node\n");
  47                return;
  48        }
  49
  50        clk = of_clk_get(np, 0);
  51        if (IS_ERR(clk)) {
  52                pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
  53                return;
  54        }
  55
  56        mips_hpt_frequency = clk_get_rate(clk) / 2;
  57        clk_put(clk);
  58}
  59