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

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Pistachio clocksource/timer setup
   4 *
   5 * Copyright (C) 2014 Google, Inc.
   6 */
   7
   8#include <linux/clk.h>
   9#include <linux/clocksource.h>
  10#include <linux/init.h>
  11#include <linux/of.h>
  12#include <linux/of_clk.h>
  13
  14#include <asm/mips-cps.h>
  15#include <asm/time.h>
  16
  17unsigned int get_c0_compare_int(void)
  18{
  19        return gic_get_c0_compare_int();
  20}
  21
  22int get_c0_perfcount_int(void)
  23{
  24        return gic_get_c0_perfcount_int();
  25}
  26EXPORT_SYMBOL_GPL(get_c0_perfcount_int);
  27
  28int get_c0_fdc_int(void)
  29{
  30        return gic_get_c0_fdc_int();
  31}
  32
  33void __init plat_time_init(void)
  34{
  35        struct device_node *np;
  36        struct clk *clk;
  37
  38        of_clk_init(NULL);
  39        timer_probe();
  40
  41        np = of_get_cpu_node(0, NULL);
  42        if (!np) {
  43                pr_err("Failed to get CPU node\n");
  44                return;
  45        }
  46
  47        clk = of_clk_get(np, 0);
  48        if (IS_ERR(clk)) {
  49                pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
  50                return;
  51        }
  52
  53        mips_hpt_frequency = clk_get_rate(clk) / 2;
  54        clk_put(clk);
  55}
  56