drivers/clocksource/timer-probe.c

   1 /*
   2  * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/acpi.h>
  18 #include <linux/init.h>
  19 #include <linux/of.h>
  20 #include <linux/clocksource.h>
  21
  22 extern struct of_device_id __timer_of_table[];
  23
  24 static const struct of_device_id __timer_of_table_sentinel
  25         __used __section(__timer_of_table_end);
  26
  27 void __init timer_probe(void)
  28 {
  29         struct device_node *np;
  30         const struct of_device_id *match;
  31         of_init_fn_1_ret init_func_ret;
  32         unsigned timers = 0;
  33         int ret;
  34
  35         for_each_matching_node_and_match(np, __timer_of_table, &match) {
  36                 if (!of_device_is_available(np))
  37                         continue;
  38
  39                 init_func_ret = match->data;
  40
  41                 ret = init_func_ret(np);
  42                 if (ret) {
  43                         pr_err("Failed to initialize '%pOF': %d\n", np, ret);
  44                         continue;
  45                 }
  46
  47                 timers++;
  48         }
  49
  50         timers += acpi_probe_device_table(timer);
  51
  52         if (!timers)
  53                 pr_crit("%s: no matching timers found\n", __func__);
  54 }