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
  17 unsigned int get_c0_compare_int(void)
  18 {
  19         return gic_get_c0_compare_int();
  20 }
  21
  22 int get_c0_perfcount_int(void)
  23 {
  24         return gic_get_c0_perfcount_int();
  25 }
  26 EXPORT_SYMBOL_GPL(get_c0_perfcount_int);
  27
  28 int get_c0_fdc_int(void)
  29 {
  30         return gic_get_c0_fdc_int();
  31 }
  32
  33 void __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 }