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 EXPORT_SYMBOL_GPL(get_c0_perfcount_int);
  30
  31 void __init plat_time_init(void)
  32 {
  33         struct device_node *np;
  34         struct clk *clk;
  35
  36         of_clk_init(NULL);
  37         clocksource_of_init();
  38
  39         np = of_get_cpu_node(0, NULL);
  40         if (!np) {
  41                 pr_err("Failed to get CPU node\n");
  42                 return;
  43         }
  44
  45         clk = of_clk_get(np, 0);
  46         if (IS_ERR(clk)) {
  47                 pr_err("Failed to get CPU clock: %ld\n", PTR_ERR(clk));
  48                 return;
  49         }
  50
  51         mips_hpt_frequency = clk_get_rate(clk) / 2;
  52         clk_put(clk);
  53 }