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
  20 unsigned int get_c0_compare_int(void)
  21 {
  22         return gic_get_c0_compare_int();
  23 }
  24
  25 int get_c0_perfcount_int(void)
  26 {
  27         return gic_get_c0_perfcount_int();
  28 }
  29
  30 void __init plat_time_init(void)
  31 {
  32         struct device_node *np;
  33         struct clk *clk;
  34
  35         of_clk_init(NULL);
  36         clocksource_of_init();
  37
  38         np = of_get_cpu_node(0, NULL);
  39         if (!np) {
  40                 pr_err("Failed to get CPU node\n");
  41                 return;
  42         }
  43
  44         clk = of_clk_get(np, 0);
  45         if (IS_ERR(clk)) {
  46                 pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
  47                 return;
  48         }
  49
  50         mips_hpt_frequency = clk_get_rate(clk) / 2;
  51         clk_put(clk);
  52 }