arch/sh/kernel/timers/timer.c

   1 /*
   2  * arch/sh/kernel/timers/timer.c - Common timer code
   3  *
   4  *  Copyright (C) 2005  Paul Mundt
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/timer.h>
  13 #include <linux/string.h>
  14 #include <asm/timer.h>
  15
  16 static struct sys_timer *sys_timers[] = {
  17 #ifdef CONFIG_SH_TMU
  18         &tmu_timer,
  19 #endif
  20 #ifdef CONFIG_SH_MTU2
  21         &mtu2_timer,
  22 #endif
  23 #ifdef CONFIG_SH_CMT
  24         &cmt_timer,
  25 #endif
  26         NULL,
  27 };
  28
  29 static char timer_override[10];
  30 static int __init timer_setup(char *str)
  31 {
  32         if (str)
  33                 strlcpy(timer_override, str, sizeof(timer_override));
  34         return 1;
  35 }
  36 __setup("timer=", timer_setup);
  37
  38 struct sys_timer *get_sys_timer(void)
  39 {
  40         int i;
  41
  42         for (i = 0; i < ARRAY_SIZE(sys_timers); i++) {
  43                 struct sys_timer *t = sys_timers[i];
  44
  45                 if (unlikely(!t))
  46                         break;
  47                 if (unlikely(timer_override[0]))
  48                         if ((strcmp(timer_override, t->name) != 0))
  49                                 continue;
  50                 if (likely(t->ops->init() == 0))
  51                         return t;
  52         }
  53
  54         return NULL;
  55 }