arch/arm/mach-ux500/timer.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2011
   3  *
   4  * License Terms: GNU General Public License v2
   5  * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson
   6  */
   7 #include <linux/io.h>
   8 #include <linux/errno.h>
   9 #include <linux/clksrc-dbx500-prcmu.h>
  10 #include <linux/clocksource.h>
  11 #include <linux/of.h>
  12 #include <linux/of_address.h>
  13
  14 #include "setup.h"
  15
  16 #include "db8500-regs.h"
  17 #include "id.h"
  18
  19 static const struct of_device_id prcmu_timer_of_match[] __initconst = {
  20         { .compatible = "stericsson,db8500-prcmu-timer-4", },
  21         { },
  22 };
  23
  24 void __init ux500_timer_init(void)
  25 {
  26         void __iomem *prcmu_timer_base;
  27         void __iomem *tmp_base;
  28         struct device_node *np;
  29
  30         if (cpu_is_u8500_family() || cpu_is_ux540_family())
  31                 prcmu_timer_base = __io_address(U8500_PRCMU_TIMER_4_BASE);
  32         else
  33                 ux500_unknown_soc();
  34
  35         np = of_find_matching_node(NULL, prcmu_timer_of_match);
  36         if (!np)
  37                 goto dt_fail;
  38
  39         tmp_base = of_iomap(np, 0);
  40         if (!tmp_base)
  41                 goto dt_fail;
  42
  43         prcmu_timer_base = tmp_base;
  44
  45 dt_fail:
  46         clksrc_dbx500_prcmu_init(prcmu_timer_base);
  47         clocksource_of_init();
  48 }