arch/arm/mach-mvebu/timer.c

   1 /*
   2  * Copyright (C) Marvell International Ltd. and its affiliates
   3  * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
   4  *
   5  * Copyright (C) 2015 Stefan Roese <sr@denx.de>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <asm/io.h>
  12 #include <asm/arch/soc.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 #define TIMER_LOAD_VAL                  0xffffffff
  17
  18 static int init_done __attribute__((section(".data"))) = 0;
  19
  20 /*
  21  * Timer initialization
  22  */
  23 int timer_init(void)
  24 {
  25         /* Only init the timer once */
  26         if (init_done)
  27                 return 0;
  28         init_done = 1;
  29
  30         /* load value into timer */
  31         writel(TIMER_LOAD_VAL, MVEBU_TIMER_BASE + 0x10);
  32         writel(TIMER_LOAD_VAL, MVEBU_TIMER_BASE + 0x14);
  33
  34 #if defined(CONFIG_ARCH_MVEBU)
  35         /* On Armada XP / 38x ..., the 25MHz clock source needs to be enabled */
  36         setbits_le32(MVEBU_TIMER_BASE + 0x00, BIT(11));
  37 #endif
  38         /* enable timer in auto reload mode */
  39         setbits_le32(MVEBU_TIMER_BASE + 0x00, 0x3);
  40
  41         return 0;
  42 }